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The solution of sodium bicarbonate is slightly basic in nature.

but with a base it ALSO acts as an even weaker acid.

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

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

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

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Q: How much is the acidity of sodium bicarbonate?
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