Question

Which of the following solution will have a pH exactly equal to $8$?

• A. ${10}^{-6}MHCl$ solution at ${25}^{\circ }C$
• B. ${10}^{-8}M\left[H^{+}\right]$ solution at ${25}^{\circ }C$
• C. $2\times {10}^{-6}$ M $Ba(OH{)}_2$ solution at ${25}^{\circ }C$
• D. ${10}^{-6}MNaOH$ solution at ${25}^{\circ }C$

Answer 1

The correct option is B ${10}^{-8}M\left[H^{+}\right]$ solution at ${25}^{\circ }C$

$pH=-log\left[H^{+}\right]=-log{10}^{-8}=8$

Hence option B is correct.