Mother’s Day is THIS Sunday!
Wednesday, May 7th: “A” Day
Thursday, May 8th: “B” Day
Agenda
 Homework questions/collect
 Lab write-up: “Titration of an Acid and a Base”
 Virtual titration
 Homework: “Titrations Practice” Worksheet
 Extra Credit Opportunity
Lab next time – be sure to
dress appropriately..
No flip-flops!
Homework Questions
Sec. 15.3 review, pg. 556: #1-12
Lab: “Titration of an Acid and a Base”
Purpose
The purpose of this lab is to determine the
normality of an unknown concentration of
sodium hydroxide, NaOH.
For an acid or a base that dissociates in a 1:1
ratio, the normality is equal to the molarity.
NaOH
Na+ + OH–
HCl + H2O
H3O+ + Cl(Both acid and base are 1:1 ratio)
Lab: “Titration of an Acid and a Base”
After the titration, the normality of the base will be
calculated using the following formula:
Normality(B) Volume(B) = Normality(A) Volume(A)
Rearrange to solve for the normality(B):
Normality(B) = Normality(A)Volume(A)
Volume(B)
Lab: “Titration of an Acid and a Base”
Calculation #4: Absolute error:
Ea = average Normality(B) – actual value
Calculation #5: Relative error:
Er = absolute error
X 100 %
actual value
Lab: “Titration of an Acid and a Base”
Write-Up
1. Title
2. Purpose
3. Hypothesis: What do you think the
concentration of the base is?
4. Materials
5. Procedure
6. Reflection Statement
Virtual Titration
Before we do our actual acid-base titration next
time, I thought it would be a good idea (and fun)
to do some virtual titrations for practice.
Follow the handout and do HCl and NaOH first.
When you’re finished, try other acid-base
combinations...
Homework:
“Titrations Practice” worksheet
Extra Credit Opportunity
Morrison High School
presents “The Wizard of
Oz”!
Friday, May 9th: 7:00 pm
Saturday, May 10th: 7:00 pm
Sunday, May 11th: 2:00 pm
Tickets: $5:00
Attend ANY performance
Have me sign your program
Bring program to class on
Mon/Tues
You will get 15
extra credit points!