# Worksheet: Buffer Capacity

In this worksheet, we will practice calculating the maximum amount of acid/base a buffer can neutralize before pH is significantly affected.

Q1:

What mass of solid in grams must be added to 0.300 L of a 0.50 M acetic acid solution to produce a buffer with a pH of 5.00? Assume a negligible change in volume as the solid is added. The of acetic acid is .

Q2:

Which of the following, if added to a buffer of acetic acid and sodium acetate, would decrease the concentration of ?

• A
• B
• C
• D
• E

Q3:

Which of the following, if added to a buffer of acetic acid and sodium acetate, would decrease the concentration of ?

• A
• B
• C
• D
• E

Q4:

Which of the following, if added to a buffer of ammonia and ammonium nitrate, would decrease the concentration of ?

• A
• B
• C
• D
• E

Q5:

Which of the following, if added to a buffer of ammonia and ammonium nitrate, would decrease the concentration of ?

• A
• B
• C
• D
• E

Q6:

Why does the pH not change significantly when a small amount of an acid or a base is added to a solution that contains equal amounts of the acid and , a salt of its conjugate base?

• A reacts with excess base, while reacts with excess acid.
• BExcess base is removed by reaction with , while excess acid is removed by reaction with .
• C is amphiprotic and reacts with and neutralizes both acids and bases; then converts to , restoring the pH.