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From this salt the benzoate ion C6H5-COO- is a base ( the other part Na+ is neutral).

This base has a pKB value of 9.80 (benzoate)

The pKacid value of its conjugated benzoic acid ( C6H5-COOH) however is

pKbenzoic-acid = 4.20 = pKa

(which is (not surprisingly) equal to 14.0-pKbase = 14.0-9.80)

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15y ago

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