Dihydrogen phosphate, H₂PO₄⁻(aq), undergoes the following acid base equilibria in blood: H₂PO₄⁻(aq) ⇌ H⁺(aq) + HPO₄²⁻(aq)⇌ H⁺(aq) + PO₄³⁻(aq). The pKa values for the first and second steps are 7.2 and 12.4, respectively. The pH of human blood is 7.37 and this is tightly regulated. Which of the following statements most accurately describes the concentrations of the different species for the above reactions in blood. (Hint, think of the titration curves for H₂PO₄⁻(aq) and HPO₄²⁻(aq) and their respective pKa's.) A) [H₂PO₄⁻(aq)] is much greater than [HPO₄²⁻(aq)] and [PO₄³⁻(aq)] B) [HPO₄²⁻(aq)] is much greater than [H₂PO₄⁻(aq)] and [PO₄³⁻(aq)]. C) [H₂PO₄⁻(aq)] and [HPO₄²⁻(aq)] are both present and greater than [PO₄³⁻(aq)]. D) [PO₄³⁻(aq)] is much larger than the other concentrations, [H₂PO₄⁻(aq)] and [HPO₄²⁻(aq)]
Dihydrogen phosphate, H₂PO₄⁻(aq), undergoes the following acid base equilibria in blood: H₂PO₄⁻(aq) ⇌ H⁺(aq) + HPO₄²⁻(aq)⇌ H⁺(aq) + PO₄³⁻(aq). The pKa values for the first and second steps are 7.2 and 12.4, respectively. The pH of human blood is 7.37 and this is tightly regulated. Which of the following statements most accurately describes the concentrations of the different species for the above reactions in blood. (Hint, think of the titration curves for H₂PO₄⁻(aq) and HPO₄²⁻(aq) and their respective pKa's.) A) [H₂PO₄⁻(aq)] is much greater than [HPO₄²⁻(aq)] and [PO₄³⁻(aq)] B) [HPO₄²⁻(aq)] is much greater than [H₂PO₄⁻(aq)] and [PO₄³⁻(aq)]. C) [H₂PO₄⁻(aq)] and [HPO₄²⁻(aq)] are both present and greater than [PO₄³⁻(aq)]. D) [PO₄³⁻(aq)] is much larger than the other concentrations, [H₂PO₄⁻(aq)] and [HPO₄²⁻(aq)]
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter16: Thermodynamics: Directionality Of Chemical Reactions
Section: Chapter Questions
Problem 103QRT
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Dihydrogen phosphate, H₂PO₄⁻(aq), undergoes the following acid base equilibria in blood: H₂PO₄⁻(aq) ⇌ H⁺(aq) + HPO₄²⁻(aq)⇌ H⁺(aq) + PO₄³⁻(aq). The pKa values for the first and second steps are 7.2 and 12.4, respectively. The pH of human blood is 7.37 and this is tightly regulated. Which of the following statements most accurately describes the concentrations of the different species for the above reactions in blood. (Hint, think of the titration curves for H₂PO₄⁻(aq) and HPO₄²⁻(aq) and their respective pKa's.)
A) [H₂PO₄⁻(aq)] is much greater than [HPO₄²⁻(aq)] and [PO₄³⁻(aq)]
B) [HPO₄²⁻(aq)] is much greater than [H₂PO₄⁻(aq)] and [PO₄³⁻(aq)].
C) [H₂PO₄⁻(aq)] and [HPO₄²⁻(aq)] are both present and greater than [PO₄³⁻(aq)].
D) [PO₄³⁻(aq)] is much larger than the other concentrations, [H₂PO₄⁻(aq)] and [HPO₄²⁻(aq)]
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