Chapter 19, Problem 50E

Interpretation Introduction

Interpretation: The concentration ratio of ${\text{H}}_{\text{2}}{\text{PO}}_{\text{4}}{}^{-}/{\text{HPO}}_{\text{4}}{}^{2-}$ and the value of $K_{\text{a}}$ is given for the reaction of phosphate buffer solution. The $\text{pH}$ value 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-Hasselbach equation. According to this equation,

$\text{pH}=\text{p}{K}_{\text{a}}+\log \frac{\left[\text{Conjugate}\text{base}\right]}{\left[\text{Weak}\text{acid}\right]}$

To determine: The $\text{pH}$ value of a sample of intracellular fluid.