Chapter 16, Problem 24QP

Interpretation Introduction

Interpretation:

The concentration of hydronium ions in a 0.62 M NaOH solution is to be calculated.

Concept introduction:

A strong base is an electrolyte which gets completely dissociated when dissolved in water to produce hydroxide ions and its conjugate acid.

${\text{BOH}}_{\left(\text{aq}\right)}\to {\text{OH}}^{-}{}_{\left(\text{aq}\right)}+{\text{B}}^{+}{}_{\left(\text{aq}\right)}$

The expression of equilibrium constant $K_w$ is as follows,

$K_w={\text{[H}}_{\text{3}}{\text{O}}^{\text{+}}{\text{][OH}}^{\text{-}}\text{]}=1.0\times {10}^{-14}$

Rearrange the above equation for hydronium ions as:

$\left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right]=\frac{1.0\times {10}^{-14}}{\left[{\text{OH}}^{-}\right]}$ …… (1)