# For what does pH stand?

Aug 7, 2015

Originally $p H$ stood for pouvoir hydrogene, and is formally defined on the logarithmic scale, $p H = - {\log}_{10} \left[{H}^{+}\right]$

#### Explanation:

Given the defintion if $p H = 7$, then $\left[{H}^{+}\right] = {10}^{-} 7 m o l {L}^{-} 1$. More positive $p H$ values describe alkaline solutions, whereas smaller or negative $p H$ values identify more acidic conditions.

Solution concentration is generally defined by "moles of solute per volume of solution".