Chapter 16, Problem 23E

Interpretation Introduction

Interpretation:

The $\text{pH}$ of the given solutions, with and without adding $0.010\text{mol}$

  $\text{HCl}$ is to be calculated.

Concept introduction: The pH of the solution is the $\log$ of the concentration of the hydronium ions released by the solution upon dissociation.

The Henderson-Hasselbalch formula provides an expression by which the pH of a buffer solution by initial concentrations of the components of the buffer solution can be calculated.

To determine: The pH of the solutions, $500\text{ml}$ of pure water, $500\text{ml}$ of a buffer solution with $0.125\text{M}$ in ${\text{HC}}_{\text{2}}{\text{H}}_{\text{3}}{\text{O}}_{\text{2}}$ and $0.115\text{M}$ in ${\text{NaC}}_{\text{2}}{\text{H}}_{\text{3}}{\text{O}}_{\text{2}}$ , $500\text{ml}$ of a buffer solution with $0.155\text{M}$ in ${\text{C}}_{\text{2}}{\text{H}}_5{\text{NH}}_{\text{2}}$ and $0.145\text{M}$ in ${\text{C}}_{\text{2}}{\text{H}}_5{\text{NH}}_{\text{3}}\text{Cl}$ , with and without adding $0.010\text{mol}$

  $\text{HCl}$ is to be determined.