Question

How can you find $\mathrm{pH}$ of the solution?

Answer 1

The $\mathrm{pH}$ of the solution-

The measure of hydrogen ion concentration which is a measure of its acidity pure water dissociate slightly into an equal concentration of hydrogen and hydroxyl. The $\mathrm{pH}$ determine the acidity and basicity of the solution and its full form is hydrogen potential.

${\mathrm{H}}_2\mathrm{O}\to {\mathrm{H}}^{+}+{\mathrm{OH}}^{-}$

Excess hydrogen ions make the solution acidic, $\mathrm{pH}$ is calculated using the expression $\mathrm{pH}=-\log \left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right]$

Example:- Calculate the pH of the solution having having hydrogen concentration is $0.0001$ moles per litre.

Solution: Given, hydrogen concentration $$\begin{gathered} =\left[{\mathrm{H}}^{+}\right] \\ =0.0001 \end{gathered}$$

$$\begin{gathered} \mathrm{pH}=-\log \left[0.0001\right] \\ \mathrm{pH}=-\log \left[{10}^{-4}\right] \\ \mathrm{pH}=-(-4) \\ \mathrm{pH}=4 \end{gathered}$$