How are pH and percent ionization related

pH refers to the direct concentration of the H+ (protons) in the solution which is pH= log[H+] in the solution.

percent ionization refers to the rate in which the proton dissociate from its acid and into the solution.

so:

% ionization = Ka of the acid
and Ka = [H+] [A^-]/ [HA]

by transitivity:

% ionization ([HA]) = [H+] and since pH = log [H+] therefore

10^%ionization ([HA]) = pH


i hope that u understand the derivation of the equation above (10^ means anti log)

I assume you are referring to an acid. Lower the pH , higher the Concentration of H+ , so which means for the same concentration of two acids---a weak acid and a strong acid , the strong acid would have a lower pH , hence a higher percentage ionization.


But pH is a very inaccurate gauge of percentage ionization, if you use a very high concentration of a weak acid , the pH may also be quite low.

So, you pKa instead. The lower the pKa , the higher the Ka, so the larger the percentage ionization irregardless of concentration of the acid.

For base, use pKb. The lower the pKa , the higher the Ka, so the larger the percentage ionization irregardless of concentration of the base.

For salt , use Ksp .

Your question is very vague because you did not state acid, base or salt. Percentage ionization of what?

pH directly correlates to the amount of ions in a solutions.