Question

The pH of decimolar solution of KOH is
a) 1 b) 4 C) 10 d) 13

Please I am Confused Help Me​

Answer 1

Decimolar solution means that molarity of KOH is 1/10 M.

So, let's find the p[OH] first:

$p[OH] = - log_{10}{(OH)}$

$\implies p[OH] = - log_{10}{ {10}^{ - 1} }$

$\implies p[OH] = - ( - 1)$

$\implies p[OH] = 1$

Now, we know that p[H] + p[OH] = 14 :

$\implies p[H] = 14 - p[OH]$

$\implies p[H] = 14 -1$

$\implies p[H] = 13$

So, pH of KOH solution is 13.