# Question #9d0d1

May 24, 2017

$10.5$

#### Explanation:

Interconverting $\text{pH}$ and $\text{pOH}$ is quite straightforward: the sum of each in a solution (at ${25}^{o} C$) always equals $14.00$:

$\text{pH" + "pOH} = 14.00$

Therefore, if the $\text{pH}$ of the solution is $3.5$, the $\text{pOH}$ of the solution is

$14.0 - 3.5 = \textcolor{red}{10.5}$