Question

If a neutral solution has $p{K}_w$ = 13.36 at 50${}^{\circ }$C, then pH of the solution is

• A. 6.68
• B. 7
• C. 7.68
• D. None of these

Answer 1

Answer: (A)

In a neutral solution
$\left[H^{+}\right]=\left[O{H}^{-}\right]\therefore pH=pOH$
$p{K}_w=pH+pOH$
$\therefore 2pH=13.36$
$\Rightarrow pH=\frac{13.36}{2}$
$=6.68$