Question

Hydrogen ion concentration in $mol/L$ in a solution of $pH=5.4$ will be:

• A. $3.98\times {10}^8$
• B. $3.88\times {10}^6$
• C. $3.68\times {10}^{-6}$
• D. $3.98\times {10}^{-6}$

Answer 1

The correct option is D $3.98\times {10}^{-6}$

The expression for pH is,

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

$=5.4$.
Hence, $\left[H^{+}\right]={10}^{-5.4}$

$=3.98\times {10}^{-6}$.