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Biochemistry 6th Edition by Reginald Garrett,Charles Grisham
Edition 6ISBN: 978-1305577206Biochemistry 6th Edition by Reginald Garrett,Charles Grisham
Edition 6ISBN: 978-1305577206 Exercise 9
Polyprotic acids: Citric acid species at various pHs
Citric acid, a tricarboxylic acid important in intermediary metabolism, can be symbolized as H3 A.
Its dissociation reactions are
H3 A ? H + + H2 A- pK a1 = 3.13
H2 A ? H + + HA 2- pK a2 = 4.76
HA 2 ? H + + A 3- pK a3 = 6.40
If the total concentration of the acid and its anion forms is 0.02 M, what are the individual concentrations of H3 A, H2 A - , HA 2- , and A 3- at pH 5.2?
Citric acid, a tricarboxylic acid important in intermediary metabolism, can be symbolized as H3 A.
Its dissociation reactions are
H3 A ? H + + H2 A- pK a1 = 3.13
H2 A ? H + + HA 2- pK a2 = 4.76
HA 2 ? H + + A 3- pK a3 = 6.40
If the total concentration of the acid and its anion forms is 0.02 M, what are the individual concentrations of H3 A, H2 A - , HA 2- , and A 3- at pH 5.2?
Explanation
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Biochemistry 6th Edition by Reginald Garrett,Charles Grisham
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