Chapter 13, Problem 81E

Interpretation Introduction

Interpretation: A solution formed by dissolving one mole of a weak acid $\text{HA}$ in $2.0\text{L}$ of solution and the equilibrium concentration of $\text{HA}$ is given. The value of $K_{\text{a}}$ for the given weak acid is to be calculated.

Concept introduction: The $\text{pH}$ of a solution is define as a figure that expresses the acidity of the alkalinity of a given solution.

The $\text{pH}$ of a solution is calculated by the formula, $\text{pH}=-\log \left[{\text{H}}^{+}\right]$

At equilibrium, the equilibrium constant expression is expressed by the formula,

$K_{\text{a}}=\frac{\text{Concentration}\text{of}\text{products}}{\text{Concentration}\text{of}\text{reactants}}$