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Basicity of AminesAmines

Why does Sulphanilic acid (p-aminobenzenesulphonic acid) exist as a Zwitter ion?

Expert Answer

It contains both an acidic group ( $-SO_3H$ ) and a basic group ( $-NH_2$ ). The proton transfers from the acid to the base, forming an internal salt ( $NH_3^+-C_6H_4-SO_3^-$ )13.

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