Chapter One

1
Example 1

• How many mL of 0.200 M NaOH will completely
  neutralize 100 mL 0.250 M H2SO4?

2
Example 2

• If 40.0 mL of 1.60 M HCl and 60.0 mL of 2.00 M
  NaOH are mixed, what are the molar concentrations
  of Na, Cl, and OH in the resulting solution?

3
Example 3

• If 100. mL of 1.00 M H3PO4 solution is mixed with
  200. mL of 1.00 M NaOH, what salt is produced,
  and what is its molarity?

4
Example 4 Titration

• What is the molarity of NaOH solution if 92.0 mL
  of this solution was completely neutralized with
  138 mL of 0.4 M H2SO4 solution?

5
Example 5 Back Titration

• 74.5 ml of 2.61 M sodium hydroxide is added to
  99.2 ml of acetic acid, and the resulting
  solution is found to be basic. It required 12.7
  ml of 1.25 M sulfuric acid to reach neutrality.
  What is the molarity of the original acetic acid
  solution?

6
Example 5 (continued)
7
Example 6 Titration

• The acidic substance in vinegar is acetic acid,
  HC2H3O2. When 6.00 g of a certain vinegar was
  titrated with 0.100 M NaOH, 40.11 mL of base had
  to be added to reach the equivalence point. What
  percent by mass of this sample of vinegar is
  acetic acid?

8
Eqivalent Weight

• One equivalent weight, or equivalent, of acid
  contains 1 mol of hydrogen ions
• One equivalent weight, or equivalent, of base
  contains 1 mol of hydroxide ions
• Examples
• NaOH
• Ba(OH)2
• HCl
• H2SO4

9
Normality
10
Example 7

• 666 g of Ba(OH)2 is dissolved in 3 L of water.
  Calculate the normality of the solution.

11
Example 8

• Calculate the normality of a solution of H3PO4 if
  500 mL of the solution react completely with 30 g
  of NaOH.

12
Normality

• The neutralization (acid-base) reaction can
  typically be presented by the net ionic equation
• H OH ? H2O
• Therefore, one equivalent of acid always reacts
  with one equivalent of base, and vice versa
• equivs. acid equivs. base
• Vacid Nacid Vbase Nbase

13
Example 9

• What volume of 3.00N solution of H3PO4 will react
  completely with 750 ml of 2.00N solution of
  Ba(OH)2?

14
Assignments Reminders

• Read Chapter 11 completely
• Read Section 4-7 of Chapter 4
• Extra Review Session 5 to 7 pm on Thursday in
  105 Heldenfels
• Review Session for Exam 3 515 to 715 pm on
  Sunday in 100 Heldenfels