# What does the pH of a solution indicate? As the hydronium ion concentration of a solution increases, does the pH of the solution increase or decrease?

Jan 19, 2017

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

#### Explanation:

And given the logarithmic scale, $\left[{H}_{3} {O}^{+}\right] = {10}^{- p H}$.

See here for $p O H$.

Given the logarithmic scale, LOW and negative values of $p H$ describe an highly acidic solution. In neutral water at $298 K$, $p H = p O H = 7$.

At temperatures higher than $298 K$, how do you think $p H$ would evolve?