Question

At ${70}^{\circ }C$ the concentration of $H^{+}$ ion in aqueous solution of $NaCl$ is ${10}^{-6}mole/lit$. The $O{H}^{-}$ ion concentration is:

• A. ${10}^{-8}mole/lit$
• B. ${10}^{-6}mole/lit$
• C. ${10}^{-7}mole/lit$
• D. ${10}^{-9}mole/lit$

Answer 1

Answer: (B)

${10}^{-6}mole/lit$

Aqueous NaCl solution is neutral solution.
So $\left[H^{+}\right]=\left[O{H}^{-}\right]$

At ${70}^{\circ }C$ the concentration of $H^{+}$ ion in aqueous solution of $NaCl$ is ${10}^{-6}mole/lit$

Therefore concentration of $O{H}^{-}$ is ${10}^{-6}mole/lit$.