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It's both a weak base and an (even weaker) acid.

base (proton acceptor) HCO3− + H2O <--> H2CO3 + OH− with pKb = 6.3

acid (proton donor) HCO3− + H2O <--> CO32− + H3O+ with pKa = 10.3

It is used to neutralize acids in the stomach as an antacid.

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11y ago

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