Chapter 11.9, Problem 11.69QAP

Interpretation Introduction

Interpretation:

Consider the buffer system HF, and its salt, NaF

a. The purpose of buffer system is to

1. Maintain [HF]

2. Maintain [F^-]

3. Maintain pH

(b)The salt of the weak acid is needed to

1. Provide the conjugate base

2. Neutralize added H₃O⁺

3. Provide the conjugate acid

(c)If OH^- is added, it is neutralized by

1. The salt

2. H₂O

3. H₃O⁺

d. When H₃O⁺ is added, the equilibrium shift in direction of the:

1. Reactants

2. Products

3. Does not change

Concept introduction:

A buffer system is a solution that resists change in pH when acids or bases added to it.

Buffer systems are made of either a weak acid and its salt or a weak base and its salt.