The pH of a solution is 3.602. Its ${\mathrm{H}}^{+}$ion concentration is

It is given to find ${\mathrm{H}}^{+}$ion concentration if pH of a solution is 3.602.

The formula relating to the concentration of hydrogen ion is

${\mathrm{P}}^{\mathrm{H}}$$=-\log \left[{\mathrm{H}}^{+}\right]$

Rearranging the equation,

$\Rightarrow \left[{\mathrm{H}}^{+}\right]={10}^{-{\mathrm{P}}^{\mathrm{H}}}$

$\Rightarrow \left[{\mathrm{H}}^{+}\right]={10}^{-3.602}$

$\Rightarrow \left[{\mathit{H}}^{+}\right]=2.500\times {10}^{-4}$

Hence the correct answer (C)$2.5\times {10}^{-4}$