Chapter 17, Problem 107SAE

Interpretation Introduction

Interpretation:

The correct option needs to be selected for the effect on pH when 0.001 mol KOH is added to 1.00 L of 0.10 M ${\text{NH}}_{\text{3}}$ -0.10 M ${\text{NH}}_4\text{Cl}$ buffer solution.

Concept introduction:

For a buffer solution, the pH can be determined using the following relation.

$pH=p{K}_a+\log \frac{[{\text{A}}^{-}]}{[\text{HA}]}$

Here, $p{K}_a$ is calculated as follows:

$p{K}_a=-\log K_a$

Where, $K_a$ is acid dissociation constant of weak acid.

The relation between acid dissociation constant and base dissociation constant is as follows:

$K_w=K_a\times K_b$

Here, $K_w$ is ionic product of water.