[sodium.dioxid]

Out of a particular confusion of mine which is difficult to communicate to you, I made up a question and answered it. Is my answer correct?

Question:
A weak acid increases the equilibrium hydronium concentration of water by 1.00x10^-8M. Is [ionized acid] greater than this number?

Answer:
I think the answer is yes because there are two equilibria at work here; Ka AND Kw. As H3O+ is increasing, some of it is simultaneously being used up to make H2O so that the Kw remains at it's constant value. Therefore, more H3O+ was actually used than what the change suggests.
In fact, I think [ionized acid] = Δ [H3O+] + -Δ [OH-]

Is my analysis correct?

[Borek]

Yes.