# What is the pH of a solution that has a hydronium ion concentration of 1.00*10^-10 M?

Nov 5, 2015

Take the negative log of your ${H}_{3} {O}^{+}$ molarity.

#### Explanation:

The pH of an aqueous solution can be found simply by taking the negative logarithm of your hydronium ion concentration, or stated mathematically,

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

So, if we plug in your numbers we'll get:

pH = $- \log \left[1.00 \cdot {10}^{-} 10\right]$

Throw that bad boy in your calculator and you'll find your pH. Or I can just tell you. (It's 10.)