Question

The concentration of hydronium $\left(H_3{O}^{+}\right)$ ion in water is

• A. $Zero$
• B. $1\times {10}^{-14}gmion/litre$
• C. $1\times {10}^{7}gmion/litre$
• D. $1\times {10}^{-7}gmion/litre$

Answer 1

The correct option is D $1\times {10}^{-7}gmion/litre$

as,

$H_3{O}^{+}\rightleftharpoons O{H}^{-}+H_2$

and, $pOH+pH=14$

$\Rightarrow \left[H^{+}\right]+\left[O{H}^{-}\right]={10}^{-14}$

$\Rightarrow {10}^{-7}+{10}^{-7}={10}^{-14}$

$\Rightarrow \left[H_3{O}^{+}\right]=\left[O{H}^{-}\right]={10}^{-7}gmion/litre$.