Question

Which of the following aqueous solutions are good buffer systems?

(Select all that apply.)

a. 0.22 M acetic acid + 0.15 M potassium acetate
b. 0.27 M nitric acid + 0.16 M potassium nitrate
c. 0.29 M ammonium nitrate + 0.32 M ammonia
d. 0.20 M calcium hydroxide + 0.23 M calcium chloride
e. 0.31 M hydrofluoric acid + 0.22 M potassium fluoride

Answer 1

The following aqueous solutions represents good buffer systems:

• 0.22 M acetic acid + 0.15 M potassium acetate
• 0.29 M ammonium nitrate + 0.32 M ammonia

What is a buffer?

A buffer is a solution used to stabilize the pH (acidity) of a liquid.

A good buffer system is generally known to contain close or equal concentrations of a weak acid and its conjugate base.

Based on the above explanation, the following represents a good buffer system as they are between their weak acid and conjugate base:

• 0.22 M acetic acid + 0.15 M potassium acetate
• 0.29 M ammonium nitrate + 0.32 M ammonia

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