Laxari9943 Laxari9943

22-01-2020
Chemistry

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What is the acid dissociation constant (Ka) for the reaction of carbonic acid (H2CO3) with water?

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gbustamantegarcia054 gbustamantegarcia054

23-01-2020

Answer:

Ka1 = [H3O+][HCO3-] / [H2CO3]

Ka2 = [H3O+][CO32-] / [HCO3-]

Explanation:

diprotic acid:

H2CO3 + H2O ↔ H3O+ + HCO3-

∴ Ka1 = [H3O+][HCO3-] / [H2CO3]

HCO3- + H2O ↔ H3O+ + CO32-

∴ Ka2 = [H3O+][CO32-] / [HCO3-]

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