Question

If the pH of a solution is $2$, the hydrogen ion concentration in moles per litre is :

• A. $1\times {10}^{-14}$
• B. $1\times {10}^{-2}$
• C. $1\times {10}^{-7}$
• D. $1\times {10}^{-12}$

Answer 1

Answer: (B)

$1\times {10}^{-2}$

If the $pH$ of the solution is 2.

$pH=-log\left[H^{+}\right];\left[H^{+}\right]={10}^{-pH}$

$2=-log\left[H^{+}\right]$

$\therefore \left[H^{+}\right]=1\times {10}^{-2}mol/lit$