Chapter 18.5, Problem 18.7BFP

Interpretation Introduction

Interpretation: Given the value of p ${\text{K}}_{\text{a}}$ of 0.25M solution, $\left[\text{H}\text{O}{}^{{}^{\text{+}}}\right]$ and pH must be found.

Concept introduction: ${\text{C}}_{\text{6}}{\text{H}}_{\text{5}}\text{COOH}$ will dissociate very little because ${\text{C}}_{\text{6}}{\text{H}}_{\text{5}}\text{COOH}$ has a small value of $K_{\text{a}}$ . $\text{p}{K}_{\text{a}}$ is the negative logarithm of $K_{\text{a}}$ . The $K_{\text{a}}$ gives the ratio of the concentrations of the products to the reactants. From $\left[\text{H}\text{O}{}^{{}^{\text{+}}}\right]$ , the nature of the solution can be determined.