Polyprotic acids: Citric acid species at various pHs
Citric acid, a tricarboxylic acid important in intermediary metabolism, can be symbolized as H3A.
Its dissociation reactions are
H3A ⇌ H++H2A- pKa1 = 3.13
H2A⇌H++HA2- pKa2 = 4.76
HA2⇌ H++A3- pKa3 = 6.40
If the total concentration of the acid and its anion forms is 0.02 M, what are the individual concentrations of H3A, H2A-, HA2-, and A3- at pH 5.2?
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