Acid Question

[ieatshrimp24]

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Looking over some acids and bases notes. Why is it true that a weak acid dissociates so that [H+] = [A-]? I thought this was only for strong acids. Can anyone please explain?

 

[Cawolf]

You start with some amount of HA.

When HA dissociates (no matter how much) each equivalent of HA ----> H+ + A- so you have an even amount of H+ and A-.