Concentration of H30+ = A- ??

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Concentration of H30+ = A- ??

Postby aisteles1G » Tue Jan 15, 2019 8:29 pm

In one of the examples in the 7th edition for 6D.2, they equate the concentration of [h30+] = [A-] but it doesn't really explain why you're allowed to assume this is true so I'm confused. Will this always be true with all weak acids in a aqueous solution?
Thanks for any help!

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Re: Concentration of H30+ = A- ??

Postby ThomasLai1D » Tue Jan 15, 2019 9:41 pm

In order for one H3O+ to be formed, one A- must also be formed (in an HA acid), because the proton (H+) transfers from the acid to the H2O. It is a one to one mole ratio. Therefore, they must be equivalent.

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