# How do you calculate the pH of an acid base mixture?

Oct 13, 2016

$p H = - {\log}_{10} \left[{H}_{3} {O}^{+}\right]$

#### Explanation:

That's the defining relationship, which must be committed to memory, as well as the relationship for $p O H$:

$p O H = - {\log}_{10} \left[H {O}^{-}\right]$

In water, $p H + p O H = 14$ under standard conditions.

See elsewhere for examples of using $p O H$ and $p H$ in a calculation.

And whatever you do, do not be intimidated by the $\log$ function. It was introduced to make complex calculations easier, and it does. If you have problems, voice them here, and someone will help you.