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Fumaric is a diprotic acid (H2Fu). What is the equilibrium pH of a 0.075 M (NH4)2Fu solution? The pKal and pka2 are 3.02 and 4.48

Fumaric is a diprotic acid (H2Fu). What is the equilibrium pH of a 0.075 M (NH4)2Fu solution? The pKal and pka2 are 3.02 and 4.48 for fumaric acid. The pka for ammonium is 9.25. Is the solution a buffer

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