Chapter 24, Problem 31E

Interpretation Introduction

Interpretation: The pH of given pyridine solution is to be calculated.

Concept introduction: Pyridine is weaker base and accept proton from the solution. The ionization of pyridine is given as,

${\text{C}}_{\text{5}}{\text{H}}_{\text{5}}\text{N}\left(aq\right)+{\text{H}}_{\text{2}}\text{O}\left(l\right)\stackrel{}{\rightleftharpoons }{\text{C}}_{\text{5}}{\text{H}}_{\text{5}}{\text{NH}}^{+}\left(aq\right)+{\text{OH}}^{-}\left(aq\right)$

The pH is defined as the negative logarithm of concentration of ${\text{H}}^{\text{+}}$ ions. The formula used for calculating pH of the solution is,

$\text{pH}=-\log \left[{\text{H}}^{\text{+}}\right]$