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- Wednesday, August 24, 2011 - Margaret Gogola joined the chat. (9:00 pm) - Anna Griffith joined the chat. (9:00 pm) - Emily Breedlove joined the chat. (9:00 pm) - Lisette Arias joined the chat. (9:00 pm) - Julliane Swick joined the chat. (9:00 pm) - Lilly Porter joined the chat. (9:00 pm) - Daniel DeLeon joined the chat. (9:00 pm) - Jorge Brambila joined the chat. (9:00 pm) Marcos Oliveira good evening folks 9:01 - Maria Guillen joined the chat. (9:01 pm) - Tram Le joined the chat. (9:01 pm) Rebeca Jimenez Hello 9:01 Cynthia Mermeia Good evening 9:01 Emily Kopecki hola 9:01 Robert Ibarra Evening. 9:01 Adam Martinez hey 9:01 Lilly Porter hello 9:01 Julliane Swick good evening Dr. O 9:01 Nkechiamaka Nwosu HI 9:01 - Brittny Wolda joined the chat. (9:01 pm) Daniel DeLeon howdy 9:01 - Carla Sorbel joined the chat. (9:01 pm) Jorge Brambila Hi 9:01 - Sonya Valle joined the chat. (9:01 pm) Glenn Kim good evening 9:01 Nathaniel Oyefeso ciao 9:01 Gregory Ulmer hey 9:01 Brittny Wolda hello 9:01 Lisette Arias good evening everone 9:01 Daniel DeLeon haloah 9:01 - Crystal Peterson joined the chat. (9:02 pm) - Teri Randall left the chat. (9:02 pm) - - Adaeze Amuzie joined the chat. (9:02 pm) Gerald Reyna howdy 9:02 Marcos Oliveira how can I be of assistance? 9:02 Mary Lomas hola 9:02 Emily Kopecki well i guess i will start this rodeo....i thought after today's class i understood the titration and concentration graph but i dont. 9:02 Cynthia Mermeia Still confused about the question at the end of class today!! - Trang-Ahn Bui joined the chat. (9:02 pm) Robert Ibarra Myself as well... 9:02 - Cristina Renteria appears to be offline. (9:02 pm) Nathaniel Oyefeso ditto 9:02 Emily Breedlove as am I! 9:02 Cynthia Mermeia Why was it of a different amino acid? 9:02 Mary Lomas what emily said 9:02 Cynthia Mermeia Thought we didnt need to memorize pK values -- 9:03 9:02 Nathaniel Oyefeso I need help with interpreting the graphs...based on ph and pka values given 9:03 Marcos Oliveira So the issue is at what pH can a compound that is being titrated act as a buffer correct? 9:03 Nkechiamaka Nwosu these questions on the quiz...i think we all need help on them.many of us are lost. like at which point of the titration curve... 9:04 - Brittny Wolda left the chat. (9:04 pm) Lilia Esquivel same here the quiz was totally confusing to me 9:04 Emily Kopecki yes and today we just discussed ionization...what constitutes "positive ionization?" and i agree quiz was no bueno for me 9:04 9:04 Robert Ibarra Emily beat me to the question..... 9:05 Glenn Kim NH4+? 9:05 Robert Ibarra And the quiz was a bummer. 9:05 Cynthia Mermeia No - I know what pH its + or - 1 of the pK value -- but how would we have got that question right on an exam without having our books in front of us to tell us the pK value 9:05 - Marcos Oliveira joined the call. (9:05 pm) - Anna Griffith left the chat. (9:05 pm) - You joined the call. (9:05 pm) - Jorge Brambila joined the call. (9:05 pm) - for the buffering zone 9:05 Nkechiamaka Nwosu we are all scared for the quiz!! we need HELP!!!!! 9:05 i meant the TEST!! we are not ready we are lost 9:06 Carolyn McDonald I also found the quiz challenging I hope we can practice similar question. 9:06 Nathaniel Oyefeso ditto 9:06 Robert Ibarra I can hear. 9:06 Cynthia Mermeia i can hear too 9:06 - Adam Martinez joined the call. (9:07 pm) Julliane Swick i can hear too 9:07 Gerald Reyna im listening in 9:07 - Carolyn McDonald joined the call. (9:07 pm) Trang-Ahn Bui i can hear too 9:07 - Daniel DeLeon joined the call. (9:07 pm) - Tram Le joined the call. (9:07 pm) - Yankton Wyatt joined the chat. (9:07 pm) - Nathaniel Oyefeso joined the call. (9:07 pm) - Rebeca Jimenez joined the call. (9:07 pm) - - Mary Lomas joined the call. (9:07 pm) - Nkechiamaka Nwosu joined the call. (9:07 pm) - Teri Randall joined the chat. (9:07 pm) Andrew Young echoooo 9:07 - Cristina Renteria joined the chat. (9:07 pm) - Julliane Swick left the call. (9:07 pm) - Beth Williams joined the call. (9:07 pm) - Andrew Wagner joined the chat. (9:07 pm) Lilia Esquivel echoooooo 9:07 Cynthia Mermeia echo 9:07 - Nathaniel Oyefeso left the call. (9:07 pm) Lilly Porter bad feedback 9:07 Gerald Reyna people need to put on headphones Nathaniel Oyefeso very bad... 9:08 Gerald Reyna or turn down volume Margaret Gogola big echo Gerald Reyna 9:08 9:08 9:07 or that will happen 9:08 - Nkechiamaka Nwosu left the call. (9:08 pm) Nathaniel Oyefeso i dont have headphonse on me.. 9:08 - Beth Williams left the call. (9:08 pm) Andrew Wagner anything going on here? 9:08 Minh Tran can we please type, you are echoing Dr. O 9:08 Cristina Renteria where is Dr.O 9:08 Gerald Reyna well anyone that has headphones, please use them 9:08 - Nephy John joined the chat. (9:08 pm) - Gregory Ulmer left the call. (9:08 pm) Trang-Ahn Bui big echoing 9:08 - Beth Williams joined the call. (9:08 pm) - Gregory Ulmer joined the call. (9:09 pm) - Nephy John joined the call. (9:09 pm) - Nephy John left the call. (9:09 pm) - Carolyn McDonald left the call. (9:09 pm) Andrew Young make sure your talk is off so we dont hear echo through everyones computer Lilia Esquivel 9:09 i dn't have headphones 9:09 Gerald Reyna it shows that Cynthia is echoing the loudest 9:09 - Cynthia Mermeia left the call. (9:09 pm) - Carolyn McDonald joined the call. (9:09 pm) Nkechiamaka Nwosu i could not hear you Dr. O. All I hear was echo. 9:09 - Andrew Wagner joined the call. (9:09 pm) Marcos Oliveira looks like head phones might not work because of echo 9:09 - Adam Martinez left the call. (9:09 pm) Margaret Gogola totally 9:09 - Crystal Peterson left the call. (9:09 pm) - Andrew Young left the call. (9:09 pm) - Robert Ibarra left the call. (9:09 pm) Marcos Oliveira so I will resort to typing 9:10 - Tram Le left the call. (9:10 pm) Nathaniel Oyefeso ok lets type please.... 9:10 Nkechiamaka Nwosu okay 9:10 - Maria Guillen left the call. (9:10 pm) Gerald Reyna its just that peoples speakers are going into their mic - Shelea Weber left the call. (9:10 pm) - Jorge Brambila left the call. (9:10 pm) Robert Ibarra Yes sir. 9:10 Marcos Oliveira Look at the titration graph 9:10 - Brian Coffee joined the chat. (9:10 pm) Nathaniel Oyefeso typing... 9:10 Gerald Reyna if everyone mutes their mic then dr o can talk - Jennifer Ma left the call. (9:10 pm) - Lilia Esquivel left the call. (9:10 pm) Margaret Gogola so if no one talks will it work? 9:10 - Mary Lomas left the chat. (9:10 pm) Gerald Reyna yes 9:10 - Brian Coffee joined the call. (9:10 pm) - Tram Le joined the call. (9:10 pm) - Rebeca Jimenez left the call. (9:10 pm) - Jorge Brambila joined the call. (9:10 pm) Nathaniel Oyefeso lets type... 9:10 9:10 9:10 - Margaret Gogola left the call. (9:11 pm) - Julliane Swick joined the call. (9:11 pm) Teri Randall i have headphones just not sure how to do it 9:11 - Rebeca Jimenez joined the call. (9:11 pm) I can't hear any of you!! lol 9:11 - Cynthia Mermeia joined the call. (9:11 pm) Gerald Reyna right now Dr. O should be able to speak as long as everyone else only clicks talk when theyre actually speaking 9:11 - Shelea Weber joined the call. (9:11 pm) - Teri Randall joined the call. (9:11 pm) Carolyn McDonald sound is clear now 9:11 Cynthia Mermeia how do you mute? 9:11 - Jennifer Ma joined the call. (9:11 pm) Carla Sorbel We can't hear anything 9:11 Andrew Young hes typing 9:12 Marcos Oliveira does everyone have the titration a titration curve with them - Daniel Alejandro joined the chat. (9:12 pm) - Lilia Esquivel joined the call. (9:12 pm) Adam Martinez 9:12 how can i join the call? 9:12 - Brian Coffee left the call. (9:12 pm) - Lilia Esquivel left the call. (9:12 pm) Sonya Valle yes 9:12 Emily Breedlove Yes 9:12 - Thomas Giang joined the chat. (9:12 pm) Emily Kopecki yes 9:12 Robert Ibarra yes 9:12 Cristina Renteria yes 9:12 - Daniel Alejandro joined the call. (9:12 pm) Rachel Rugeley yes 9:12 Carla Sorbel yes 9:12 Nephy John yes 9:12 Lisette Arias yes 9:12 - Thomas Giang joined the call. (9:12 pm) Rebeca Jimenez yes 9:12 Brian Coffee yes 9:12 Teri Randall yes 9:12 Jennifer Ma click on the telephone in the upper left corner of chat room window - Philip Nguyen joined the chat. (9:12 pm) - Adam Martinez joined the call. (9:12 pm) - Rachel Rugeley joined the call. (9:12 pm) - Cristina Renteria joined the call. (9:12 pm) - Rachel Rugeley left the call. (9:12 pm) - Mary Lomas joined the chat. (9:13 pm) - Lilia Esquivel joined the call. (9:13 pm) - Margaret Gogola joined the call. (9:13 pm) - Yankton Wyatt joined the call. (9:13 pm) - Andrew Young joined the call. (9:13 pm) - Thomas Giang left the call. (9:13 pm) - Shelea Weber left the call. (9:13 pm) - Thomas Giang joined the call. (9:13 pm) Teri Randall Everyone cllick on the telephone in the top left hand corner - Carla Sorbel joined the call. (9:13 pm) Gerald Reyna Teri needs to mute microphone 9:13 9:13 9:12 - Nkechiamaka Nwosu joined the call. (9:13 pm) - Brian Coffee joined the call. (9:13 pm) were getting your feedback 9:13 - Nephy John joined the call. (9:13 pm) Rachel Rugeley how do you mute the microphone? 9:13 Margaret Gogola it is, click the talk button 9:13 - Yankton Wyatt left the call. (9:13 pm) - Lilly Porter left the chat. (9:13 pm) - Yankton Wyatt joined the call. (9:13 pm) Teri Randall how do i mute microphone 9:13 Gerald Reyna click talk button 9:13 Andrew Wagner talk button 9:13 Margaret Gogola click the talk button 9:13 Marcos Oliveira ok so let us go back to the titration curve Gerald Reyna only click talk when youre speaking - Mary Lomas left the chat. (9:14 pm) - Andrew Young left the call. (9:14 pm) - 9:13 9:13 - Daniel Alejandro left the call. (9:14 pm) - Shelea Weber joined the call. (9:14 pm) - Lilly Porter joined the chat. (9:14 pm) - Lilly Porter joined the call. (9:14 pm) - Francess Uzowulu joined the chat. (9:14 pm) - Nkechiamaka Nwosu left the call. (9:14 pm) - Francess Uzowulu joined the call. (9:14 pm) Teri Randall So you have to unclick it when youre not speaking Gerry?? 9:14 Rebeca Jimenez you can turn your mic off by hitting the talk button right?? Marcos Oliveira ok back yo thr graph p. 41 9:14 - Daniel Alejandro joined the call. (9:14 pm) - Nkechiamaka Nwosu joined the call. (9:14 pm) Gerald Reyna yes, thats right Teri 9:15 Teri Randall ok, im on the graph 9:15 - Nkechiamaka Nwosu left the call. (9:15 pm) - Beth Williams left the call. (9:15 pm) Julliane Swick yes let's go bk to the titration curve 9:15 - Nkechiamaka Nwosu joined the call. (9:15 pm) - Nkechiamaka Nwosu left the call. (9:15 pm) - 9:14 Teri Randall Thanks Gery!! (sp) 9:15 - Thomas Giang left the call. (9:15 pm) - Rachel Rugeley joined the call. (9:15 pm) Cynthia Mermeia Please invite Yoomin Oh 9:15 - Shelea Weber left the call. (9:15 pm) - Tram Le left the call. (9:15 pm) - Margaret Gogola left the call. (9:15 pm) - Cynthia Mermeia left the call. (9:15 pm) - Yoomin Oh joined the chat. (9:15 pm) Andrew Wagner teri push talk button to turn off mic 9:15 - Lilly Porter left the call. (9:15 pm) - Cristina Renteria left the call. (9:15 pm) Marcos Oliveira notice first that as you increase base added there is little chnage in pH - Lilly Porter joined the call. (9:16 pm) - Rebeca Jimenez left the call. (9:16 pm) - Maria Guillen left the chat. (9:16 pm) - Brian Coffee left the call. (9:16 pm) - Adam Martinez left the call. (9:16 pm) - Lisette Arias left the call. (9:16 pm) - Jennifer Ma left the call. (9:16 pm) - Emily Breedlove left the call. (9:16 pm) - 9:15 - Nephy John left the call. (9:16 pm) - Rebeca Jimenez joined the call. (9:16 pm) Teri Randall Oops, sorry i thought i had already 9:16 - Thomas Giang joined the call. (9:16 pm) - Sonya Valle left the call. (9:16 pm) Marcos Oliveira the hatched area represents the area where there is buffering 9:16 However the point of optimal buffering is the midpoint 9:16 - Andrew Wagner left the call. (9:16 pm) Gerald Reyna Daniel, we can hear you typing 9:17 Teri Randall lol!! 9:17 - Cynthia Mermeia joined the call. (9:17 pm) Julliane Swick lol 9:17 Carolyn McDonald The titration curve on the clicker question looked different than the one on pg 41. It was hard to tell the midpoint on clicker question. 9:17 Rebeca Jimenez Daniel Alejandro 9:17 Marcos Oliveira at the midpoint you can add acid or base and there will be an equal chance of buffering either cid or base 9:17 Andrew Young whats the difference between midpoint and equivalence point? 9:18 - Emily Breedlove joined the call. (9:18 pm) Gerald Reyna Dr O is that your dog? 9:18 - Karin Dentino joined the chat. (9:18 pm) - Lisette Arias joined the call. (9:18 pm) Gregory Ulmer ya it is 9:18 - Jennifer Ma joined the call. (9:18 pm) - Carla Sorbel left the call. (9:18 pm) - Margaret Gogola joined the call. (9:18 pm) - Crystal Peterson joined the call. (9:18 pm) Gerald Reyna well its been picking up someones keyboard 9:18 - Tram Le joined the call. (9:18 pm) Teri Randall I just heard someone say "i havent even been typing" Gerald Reyna Dr. O, i think it might be safe to speak 9:19 Marcos Oliveira yes I can hear you 9:19 - Andrew Young joined the call. (9:19 pm) - Shelea Weber joined the call. (9:19 pm) - Brian Coffee joined the call. (9:19 pm) - Yoomin Oh joined the call. (9:20 pm) - 9:18 Jennifer Ma She mean polyprotic titration curves like in the clicker quiz 9:20 - Andrew Wagner joined the call. (9:20 pm) - Nephy John joined the call. (9:20 pm) - Yoomin Oh left the call. (9:20 pm) - Robert Ibarra joined the call. (9:20 pm) Marcos Oliveira if you have a graph that has multiple groups titrating then you need to look for the zones of "plateu" 9:20 each "plateu zone" represents a group being titrated 9:20 - Tram Le left the call. (9:20 pm) you look at the midpoint of reach titration and that is the pKa for that group 9:21 - Brian Coffee left the call. (9:21 pm) Nathaniel Oyefeso makes sense 9:21 Marcos Oliveira in the graph I gave in class there were two plateus that is two group sbeing titrated - Amanda Chavez joined the chat. (9:21 pm) yes 9:21 - Daniel Alejandro left the call. (9:22 pm) - Amanda Chavez joined the call. (9:22 pm) - Amanda Chavez left the call. (9:22 pm) yes two zones of buffering 9:22 - Robert Ibarra left the call. (9:22 pm) - Margarita Lopez-Figueroa joined the chat. (9:22 pm) a positive charge 9:22 9:21 - Beth Williams joined the call. (9:22 pm) Margarita Lopez-Figueroa thanks minh! 9:22 Marcos Oliveira a lysine that is protonated 9:22 Cynthia Mermeia Dr. O - you can talk -- we can hear you typing clearly! 9:22 - Robert Ibarra joined the call. (9:22 pm) Andrew Wagner yes 9:23 Shelea Weber im in wiley plus. what is the figure number for what ya'll are talking about Rebeca Jimenez yes 9:23 Cynthia Mermeia yes 9:23 Crystal Peterson yes 9:23 Emily Kopecki yes 9:23 Andrew Young dr. o couls you invite hersh joshi 9:23 Minh Tran yes much better! 9:23 - Daniel Alejandro joined the call. (9:23 pm) - 9:23 Nathaniel Oyefeso im in the library and dont have headphones... 9:23 - Tram Le joined the call. (9:23 pm) Rebeca Jimenez you can add people by dragging them over to the name list 9:23 Marcos Oliveira I am talking about the figure I posted in class the question we dealt with 9:23 Tram Le yay 9:24 - Brian Coffee joined the call. (9:24 pm) Margarita Lopez-Figueroa hello 9:24 Gerald Reyna click the button that looks like a phone margarita so you can hear dr o talking 9:25 - Amanda Chavez joined the call. (9:25 pm) - Margarita Lopez-Figueroa joined the call. (9:25 pm) - Nathaniel Owusu joined the chat. (9:25 pm) - Hersh Joshi joined the chat. (9:25 pm) Margarita Lopez-Figueroa thanks you Dr O 9:25 - Nathaniel Owusu joined the call. (9:25 pm) - Hersh Joshi joined the call. (9:26 pm) - Ashley Austin appears to be offline. (9:26 pm) - Adam Martinez joined the call. (9:26 pm) - 9:25 Daniel Alejandro it killed me too 9:26 Robert Ibarra Likewise..... 9:27 Amanda Chavez yes we need to review this in class tomorrow 9:27 Hersh Joshi ditto 9:27 Shelea Weber I submitted the quiz on time but the system said that it was 12 seconds late, and now it says that it needs grading. will I get a grade 9:27 Nathaniel Oyefeso i cant hear anything!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! BYE 9:27 9:27 Rebeca Jimenez dr. o, after i took the quiz, i didn't get a grade, it says "not available" Shelea Weber mine too 9:27 Marcos Oliveira It might be that you went over time 9:28 Tram Le i got my grade 9:28 Rebeca Jimenez my time was 7 min and change 9:28 Crystal Peterson you have to click on "my grades" 9:28 9:27 Marcos Oliveira I need to look over those 9:28 Gerald Reyna same happened to me, i still had a minute left 9:28 Tram Le i yall checked "my grade"? 9:28 Thomas Giang ya it should be under the my grade tab 9:28 Emily Breedlove mine said it was unavailable go check "my grade" on the side of blackboard 9:28 Shelea Weber thank you 9:28 Carolyn McDonald Dr. O So you will tell us which plateau corresponds to which functional group - Hersh Joshi left the chat. (9:28 pm) Robert Ibarra Ok. Thanks Dr. O 9:28 Julliane Swick my grade is unavailable to see as well 9:29 Marcos Oliveira I will give you pK values you should be able to identify this in the graph 9:29 Minh Tran The discussion material articles are not available on bb 9:29 Carolyn McDonald oh yes ok thanks 9:29 9:28 Amanda Chavez like the practice problem from class today? 9:30 - Hersh Joshi joined the chat. (9:30 pm) - Julliane Swick left the call. (9:30 pm) - Julliane Swick left the chat. (9:30 pm) - Lilly Porter left the call. (9:31 pm) - Lilly Porter left the chat. (9:31 pm) - Nkechiamaka Nwosu joined the call. (9:31 pm) Andrew Young what do the equivalence points signify when you have multiple midpoints? 9:31 Robert Ibarra Thanks for asking that question.....whoever it was. 9:31 - Daniel Alejandro left the call. (9:31 pm) Marcos Oliveira we did not engage in discussion material this week as we have spent time on titrations I will not hold you responsible for deiscussion material - Trang-Ahn Bui left the call. (9:33 pm) - Trang-Ahn Bui left the chat. (9:33 pm) - Crystal Peterson left the chat. (9:33 pm) Emily Kopecki hey guys please turn off your mics....bad echo - Adaeze Amuzie left the chat. (9:33 pm) Marcos Oliveira With regard to identifying charges in AA 9:33 Gerald Reyna 9:33 9:32 9:32 Niki, if youre not talking, please click the talk button it shows that you are echoing 9:33 9:33 Margarita Lopez-Figueroa 667857767 9:33 Carla Sorbel Dr. O, Anna thought that the tripeptide Lys-Pro-Ile had only one charged group at 7, can you explain why all three of them are charged at pH7? 9:34 - Nkechiamaka Nwosu left the call. (9:34 pm) - Nephy John left the call. (9:34 pm) Andrew Young theres the n-terminus and c-terminus as well 9:34 - Hersh Joshi joined the call. (9:34 pm) Marcos Oliveira Carla hold that thought please 9:34 - Brian Coffee left the chat. (9:34 pm) - Nephy John joined the call. (9:35 pm) Carla Sorbel Each "plateu" signifies a mid-point, right? 9:35 - Brian Coffee joined the chat. (9:35 pm) Marcos Oliveira When you analyze charge you need to apply the divide and conquer approach 9:35 - Hersh Joshi left the call. (9:35 pm) - Brian Coffee joined the call. (9:35 pm) if you are talking about a free amino acid then you start by asking how many groups are bing titrated? 9:35 - Andrew Young left the call. (9:35 pm) - in the case of an amino acid there is the amino the acid and the side chain the amino gorup has a pK around 10 the acid pk around 2 9:36 - Nephy John left the call. (9:36 pm) at pH 7 what is the state of these groups? 9:36 Carla Sorbel Uhmmm, not understanding that 9:36 - Daniel Alejandro joined the call. (9:36 pm) - Daniel Alejandro left the call. (9:37 pm) Marcos Oliveira each titratable group has a different pK right? 9:37 Brian Coffee Yes 9:37 Amanda Chavez yes 9:37 Robert Ibarra yes 9:37 Emily Kopecki agreed 9:37 - Lilia Esquivel left the chat. (9:37 pm) - Brian Coffee left the call. (9:37 pm) Marcos Oliveira well then let us treat each separately 9:37 - Tram Le left the call. (9:38 pm) at pH 7 what happens to the amino group with a pK of 10 - Cynthia Mermeia left the call. (9:38 pm) - 9:38 9:36 Brian Coffee It is not ionized 9:38 Marcos Oliveira in what state is the amino group AT PH 7 9:38 Teri Randall So the Amine part of the amino acid and the side chain are going to show up on the graph separately? 9:39 Nkechiamaka Nwosu the question asked what is the net charge of the Lysine when the pH equals one and the pk is equal to 2.16. 9:39 Andrew Young its protonated 9:39 Jennifer Ma it is mostly protonated right? 9:39 Brian Coffee Mostly protonated 9:39 Tram Le yeah protonated 9:39 Teri Randall i think jennifer is right 9:39 still mostly prot 9:39 Marcos Oliveira YES AT PH7 THE AMINO GROUP WITH PK OF 10 IS PROTONATE AND HAS A CHARGE OF +1 Nkechiamaka Nwosu yes but it is asking for the net charge Carla Sorbel 9:40 9:39 Nikki, he's answering my question 9:40 Marcos Oliveira WE ARE DIVINING THE PROBLEM TO CONQUER THE QUESTION APPROACH 9:40 Nkechiamaka Nwosu sorry 9:40 Carla Sorbel I GET IT NOW!!! Thank you! 9:40 Marcos Oliveira NOW THAT WE SOLVED THE AMINO GROUP LET US LOOK AT THE ACID GROUP WITH A PK OF 3 WHAT IS THE STATE OF THIS GROUP AT PH 7 9:41 Shelea Weber it will be deprotonated? 9:41 Rebeca Jimenez deprotonated 9:41 Brian Coffee deprotonated 9:41 Sonya Valle deprotonated 9:41 - Andrew Young left the chat. (9:41 pm) Teri Randall deprot 9:41 Robert Ibarra deprotonated 9:41 - Lilia Esquivel joined the chat. (9:41 pm) - Lisette Arias left the call. (9:41 pm) - Lilia Esquivel joined the call. (9:41 pm) - Marcos Oliveira YES DEPROTONATED! IS IT INONIZED? 9:41 Lilia Esquivel thanks 9:41 - Andrew Wagner left the call. (9:42 pm) - Andrew Wagner left the chat. (9:42 pm) Tram Le because ph>pk 9:42 Jennifer Ma no since it went from +1 to neutral 9:42 Robert Ibarra neutral 9:42 Brian Coffee from +1 to a neutral 9:42 - Andrew Wagner joined the chat. (9:42 pm) Marcos Oliveira WE ARE TALKING ABOUT AN ACID GROUP CHECK TABLE 4.1 Jennifer Ma oops 9:42 Rebeca Jimenez it will be charged -1 9:42 Jennifer Ma yes its ionized..what rebeca said 9:43 Carla Sorbel yes 9:43 9:42 - Daniel Alejandro joined the call. (9:43 pm) Marcos Oliveira YES AT PH 7 THE ACID GROUP WILL BE A FULL NEGATIVE CHARGE Brian Coffee oops. charge of -1 9:43 - Robert Ibarra left the call. (9:43 pm) Amanda Chavez hola 9:43 Teri Randall it is a -1 9:43 Daniel Alejandro right on DR. O!! 9:43 - Brian Coffee joined the call. (9:43 pm) Robert Ibarra Ok. I see it. 9:43 - Hersh Joshi joined the call. (9:44 pm) - Andrew Wagner left the chat. (9:44 pm) Teri Randall it depends on what's happening to it 9:44 - Hersh Joshi left the call. (9:44 pm) - Andrew Wagner joined the chat. (9:44 pm) Rebeca Jimenez protonated 9:44 Teri Randall it's protonated 9:45 9:43 - Jorge Brambila left the call. (9:45 pm) - Andrew Wagner left the chat. (9:45 pm) it still has it's proton 9:45 the H+ 9:45 Rebeca Jimenez zero 9:45 - Andrew Wagner joined the chat. (9:45 pm) Teri Randall it's neutral 9:45 - Tram Le left the chat. (9:46 pm) very deprot 9:46 - Yoomin Oh left the chat. (9:47 pm) oops lol 9:47 Rebeca Jimenez protonated - high concentration of H+ 9:47 Lilia Esquivel deprotonated? 9:47 Teri Randall prot 9:47 Lilia Esquivel why? 9:47 oh yeahhh nevermind 9:48 - Nathaniel Oyefeso left the chat. (9:48 pm) Teri Randall it's positive 9:48 Yankton Wyatt positive 9:48 Rebeca Jimenez +1 9:48 Daniel Alejandro NH3+ 9:48 - Brian Coffee left the call. (9:48 pm) Teri Randall yeah, +1 9:48 All this info is right out of the book. We all need to really know table 4.1 9:49 Gerald Reyna so since were in a highly acidic envrionment, there are a lot of free H+, thus the amino group is taking those protons? 9:49 - Brian Coffee left the chat. (9:49 pm) - Erica Encina joined the chat. (9:49 pm) Rebeca Jimenez yes 9:49 - Cynthia Mermeia left the chat. (9:49 pm) - Erica Encina joined the call. (9:49 pm) - Daniel DeLeon left the call. (9:50 pm) Shelea Weber when you say the amino group, are we talking about the n-terminus 9:50 Teri Randall Good question Shelea, im pretty sure but I was wanting to ask him too - Karin Dentino left the chat. (9:51 pm) Dr. O, is the N-terminus considered the "amino group" 9:51 9:50 Marcos Oliveira OK I AM BACK TO TYPING 9:51 Amanda Chavez yes 9:51 Marcos Oliveira Yes the amino termiinus is a amino group 9:51 Amanda Chavez C terminus is the carboxyl group 9:51 Teri Randall Thank goodness because that's what i already had decided 9:52 Shelea Weber ok yay, i think Im getting it now. I was making it much harder than it should be 9:52 Marcos Oliveira I am talking about a free amino acid with an amino and an acidic group 9:52 Teri Randall This is making a lot more sense!!! 9:52 Marcos Oliveira a peptide always has an amino and an acid group at opposite ends 9:52 Robert Ibarra MUCH more sense! 9:52 - Erica Encina left the call. (9:52 pm) Teri Randall Yeah for Fireside!!! 9:53 Marcos Oliveira the divide and conquer approach means we treat each titratable group separately 9:53 - Beth Williams left the call. (9:53 pm) Robert Ibarra I like that approach 9:53 Marcos Oliveira in the case of an amino acid a free amino acid we have the amino, the acid and the side chain the titratable side chains of amino acids are shown in table 4.1 9:53 9:54 Teri Randall It wasn't until tonite that I finally realized that. Thank you Dr. O 9:54 Erica Encina So the C-terminus would appear on the Ala amino group? 9:54 Rebeca Jimenez How many protons would be lost from the R group of Arg in it's fully deprotonated form? 9:55 Marcos Oliveira a peptide always has only two ends one end is an amino group the other end is an acidic group Lilia Esquivel can we work out number 5 on old exam number 2? - Robert Ibarra left the chat. (9:55 pm) Marcos Oliveira I do not have the old exam handy Lilia Esquivel can i write you the question? 9:55 - Yoomin Oh joined the chat. (9:56 pm) - Hersh Joshi joined the call. (9:56 pm) - Thomas Giang left the call. (9:56 pm) - Lisette Arias joined the call. (9:56 pm) - 9:55 9:55 9:55 - Hersh Joshi left the call. (9:56 pm) Marcos Oliveira yes got it amino acid leucine 9:57 Lilia Esquivel isoleucine 9:57 Rebeca Jimenez oh nevermind, the chart highlights the only protons that are ionizable..... 9:57 Marcos Oliveira the amino acid leucine has how many titratable groups? 9:57 Lilia Esquivel 2 9:57 Rebeca Jimenez 2? 9:57 - Daniel Alejandro left the call. (9:58 pm) Marcos Oliveira yes ok what are these group? 9:58 Lilia Esquivel the amino, and carboylic 9:58 nterminus and cterminus 9:58 Marcos Oliveira yes let us assume now that pK of amino is 10 and the acidic group is 3 Lilia Esquivel ok 9:59 - Rebeca Jimenez left the call. (10:00 pm) - Rebeca Jimenez left the chat. (10:00 pm) - 9:59 Marcos Oliveira in order to be neutral the the acid group has to be fully ionized (-1) and the amino group has to be fully ionized (+1) 10:00 add the two up and it is zero 10:00 - Lisette Arias left the call. (10:00 pm) - Rachel Rugeley left the call. (10:01 pm) (10+3)/2 and the midpoint in between is a good estimate not the only point but one point Lilia Esquivel im lost on where to get the -1 and +1 10:02 - Adam Martinez left the call. (10:02 pm) - Erica Encina joined the call. (10:02 pm) Hersh Joshi the carboxylate group has the -1 charge and the amino group has the +1 charge 10:02 Marcos Oliveira when the acid group is ionized it is negatively charged 10:02 Lilia Esquivel ohhhhhhhh 10:02 Marcos Oliveira the acid group is ionized when it is deprotonated 10:03 Teri Randall when carboxyl group is deprot it's -1 10:03 - Jorge Brambila left the chat. (10:03 pm) Marcos Oliveira when the amino group is ionized it is (+1) and is protonated - Emily Breedlove left the call. (10:04 pm) Lilia Esquivel 10:03 10:01 so its always -1 and +1 right? 10:04 Marcos Oliveira The closest number to (10+3)/2 is 5 10:04 - Margaret Gogola left the chat. (10:05 pm) Lilia Esquivel when not dealing with any of the amino acids in table 4-1 10:05 - Daniel Alejandro left the chat. (10:05 pm) Carolyn McDonald I would have though to do 10-2 and then divide by 2 10:05 Marcos Oliveira the acid group is always -1 when ionized and the amino grou alwyas +1 when ionized that is there intrinsic chsaracteritic 10:05 Emily Breedlove where did you get the number 2 to divide by? 10:05 Yankton Wyatt two charged groups 10:06 Marcos Oliveira I am estimating the average point in between 10 and 3 10:06 Emily Breedlove ok 10:06 - Hersh Joshi left the chat. (10:06 pm) Minh Tran Dr. O will we go over %protonization tomorrow? - Emily Breedlove joined the call. (10:07 pm) Marcos Oliveira 10:07 yes I will see how you all did on the quiz and will select quesion to go over right at the begining of class 10:07 Amanda Chavez awesome 10:07 Emily Kopecki all of them hahahahaha 10:08 Teri Randall I need to go take that quiz. 10:08 Marcos Oliveira I have more faith in all of you 10:08 Lilia Esquivel i didn't do so goood on the quiz it was hard 10:08 Erica Encina Didnt really do to well on that quiz either 10:08 Lilia Esquivel well i just got confused 10:08 Marcos Oliveira better now than in the exam 10:08 Amanda Chavez its just practice guys 10:08 - Teri Randall left the call. (10:08 pm) Marcos Oliveira ok gang I will stop for now and will pick this up in class tomorrow Emily Kopecki thanks 10:09 Lilia Esquivel 10:09 thanks 10:09 Carla Sorbel ty 10:09 Margarita Lopez-Figueroa Good nite Dr O see you manana 10:09 - Teri Randall left the chat. (10:09 pm) Gerald Reyna im going to try to copy the conversation if anyone wants a copy 10:09
