Chapter 3, Problem 7RQ

Summary Introduction

Interpretation:

For the solution of pH $8.3$, the hydrogen ion $\left({\text{H}}^{+}\right)$ concentration is to be calculated.

Concept introduction:

The pH scale is based on the concentration of hydrogen ions. It is a logarithmic scale. From the given value of pH, the concentration of hydrogen ions can be determined. The concentration of ${\text{H}}^{\text{+}}$ ion can be calculated as follows:

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

Taking 10 raised to pH and $\log \left[{\text{H}}^{\text{+}}\right]$ on both the sides:

$\begin{array}{l}{10}^{-\text{pH}}={10}^{\log \left[{\text{H}}^{\text{+}}\right]}\\ {10}^{-\text{pH}}=\left[{\text{H}}^{\text{+}}\right]\end{array}$