Question

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?

Answer 1

`pH=-log_10[H_3O^+]`

Explanation:

And given the logarithmic scale, `[H_3O^+]=10^(-pH)`.

See here for `pOH`.

Given the logarithmic scale, LOW and negative values of `pH` describe an highly acidic solution. In neutral water at `298K`, `pH=pOH=7`.

At temperatures higher than `298K`, how do you think `pH` would evolve?