Chapter 13, Problem 154AE

Interpretation Introduction

Interpretation: The value of $\text{p}{K}_{{\text{b}}_{\text{1}}}$, $\text{p}{K}_{{\text{b}}_{\text{2}}}$, mass and volume of quinine solution is given. By using these values, the $\text{pH}$ value of quinine solution is to be calculated.

Concept introduction: The equilibrium constant $K_{\text{b}}$ is the ratio of product of equilibrium concentrations of product to the equilibrium concentration of reactant base.

The number of moles is calculated using the formula,

$\text{Number}\text{of}\text{moles}=\text{Mass}\text{of}\text{compound}\times \frac{\text{1}\text{mol}\text{of}\text{compound}}{\text{Molar}\text{mass}\text{of}\text{compound}}$