Chapter 14, Problem 42E

Interpretation Introduction

Interpretation:

The concentration of ${\text{HNO}}_{\text{2}},{\text{NaNO}}_{\text{2}}$, volume and the required $\text{pH}$ of the buffer solution is given. The volume of ${\text{HNO}}_{\text{2}},{\text{NaNO}}_{\text{2}}$ that must be added to make the buffer solution is to be calculated.

Concept introduction:

The $\text{pH}$ value is the measure of ${\text{H}}^{+}$ ions. The relation between $\text{pH}$ and $\text{p}{K}_{\text{a}}$ is given by Henderson-Hassel Bach equation. According to this equation,

$\text{pH}=\text{p}{K}_{\text{a}}+\log \frac{\left[\text{Base}\right]}{\left[\text{Acid}\right]}$