Friday, May 9th: “A” Day
Monday, May 12th: “B” Day
Agenda
Collect Virtual /Titration Practice worksheets
Check lab write-ups
Lab Discussion
Lab: “Titration of an Acid and a Base”
Lab will be due next time…
Don’t forget extra credit opportunity…
Next time…
Chapter 15 Review
Lab: “Titration of an Acid and a Base”
1. Which acid and base will you be using?
HCl and NaOH
2.
Are these strong or weak?
Strong
Lab: “Titration of an Acid and a Base”
3. Which is the titrant?
HCl
A titrant is a solution of known
concentration that is used to titrate a
solution of unknown concentration.
Lab: “Titration of an Acid and a Base”
4. What indicator will you be using?
Phenolphthalein
5. What color is it in a basic solution?
Pink
Lab Hints
Practice controlling the stopper with just
water – you need enough control so that the
buret can deliver 1 drop.
You DO NOT have to refill the burets each
time. Simply record the starting and ending
volume each time to get the total amount of
acid/base added.
If you overshoot the end point, don’t worry.
Simply add more acid or base and re-titrate
until only 1 drop changes the color.
Safety Guidelines
Both acids and bases are corrosive – safety
goggles, aprons, and appropriate shoes must
be worn.
Be sure to lower the burets to eye level before
filling them.
Lab: “Titration of an Acid and a Base”
Calculation #4: Absolute error:
Ea = average Normality(B) – actual value
Calculation #5: Percentage error:
Er = Ea
X 100%
actual value
Lab: “Titration of an Acid and a Base”
You should have time to do 3 trials and complete
the calculations today.
Be sure to update your table of contents and
don’t forget your reflection statement…
Be safe and have…
Extra Credit Opportunity
Friday, 7:00 pm
Saturday, 7:00 pm
Sunday, 2:00 pm
Have me sign your
program
15 extra credit
points!