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9. Polyprotic Acid-Base Equilibria - Part 1 of 2

9. Polyprotic Acid-Base Equilibria / Diprotic Acids and Bases / Problem 1

Problem 1

Which of the following species is amphoteric and can act as both an acid and a base?

A

HCl (hydrochloric acid)

B

NH₄⁺ (ammonium)

C

HCO₃^- (bicarbonate)

D

NaOH (sodium hydroxide)