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Ka and Kb are inversely related. Thus, if Ka is small, Kb must be large. However,...

Ka and Kb are inversely related. Thus, if Ka is small, Kb must be large. However, the textbook says that (CO3)2- is a weak base and its conjugate, HCO3-, is a weak acid. How is this possible? Since HCO3- is a weak acid, Ka should be small. Since Ka and Kb are inversely related, shouldnt the Kb of the conjugate base to the weak acid HCO3- be large, making it a strong base?

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Answer #1

HCo​​​3​​​- is weak acid because it cannot further convert into hydrogen ions.

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