Question

For a neutral solution which one is correct ?

• A. $H_3{O}^{+}$ ions are not present.
• B. $O{H}^{-}$ ions are not present.
• C. Both $H_3{O}^{+}$ and $O{H}^{-}$ ions are not present.
• D. Both $H_3{O}^{+}$ and $O{H}^{-}$ ions are present in small but equal concentration.

Answer 1

The correct option is D Both $H_3{O}^{+}$ and $O{H}^{-}$ ions are present in small but equal concentration.

In a neutral medium , $\left[H^{+}\right]=\left[O{H}^{-}\right]=1\times {10}^{-7}mol{L}^{-1}$ at $298K$.
In water medium actually $H^{+}$ combines with $H_{2}O$ and exsits as $H_3{O}^{+}$.
hence both $H_{3}O$ and $O{H}^{-}$ are present in equal amount.