Question

When $pH$ of a solution is $2$, the hydrogen ion concentration in moles litre${}^{-1}$ will be:

• A. $1\times {10}^{-12}$
• B. $1\times {10}^{-4}$
• C. $1\times {10}^{-7}$
• D. $1\times {10}^{-2}$

Answer 1

Answer: (D)

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

The $pH$ of any solution is given as:

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

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

$\Rightarrow \left[H^{+}\right]={10}^{-2}$