The dissociation of 0.15 M phosphoric acid is given by:H3PO4(aq) + H2O(l) ⇄ H2PO4-(aq) + H3O+(aq)Ka = 7.1 x 10-3 (at 25oC)H2PO4-(aq) + H2O(l) ⇄ HPO42-(aq) + H3O+(aq)Ka = 6.3 x 10-8 (at 25oC)HPO42-(aq) + H2O(l) ⇄ PO43-(aq) + H3O+(aq)Ka = 4.5 x 10-13 (at 25oC)Use the systematic method (Mass-Balance Equations, Charge-Balance Equations, or Proton-Balance Equations) to calculate the pH of the following:a. 0.050 M NaH2PO4b. 0.050 M Na2HPO4c. 0.050 M Na3PO4

Polyprotic acid is the acid that has a tendency to lose more than one H+ ion in the solution. Given…

Answered: Use the systematic method (Mass-Balance…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The dissociation of 0.15 M phosphoric acid is given by:
H₃PO4(aq) + H₂O(l) ⇄ H₂PO₄^-(aq) + H₃O⁺(aq)
K_a = 7.1 x 10^-3 (at 25^oC)

H₂PO₄^-(aq) + H₂O(l) ⇄ HPO₄^2-(aq) + H₃O⁺(aq)
K_a = 6.3 x 10^-8 (at 25^oC)

HPO₄^2-(aq) + H₂O(l) ⇄ PO₄^3-(aq) + H₃O⁺(aq)
K_a = 4.5 x 10^-13 (at 25^oC)

Use the systematic method (Mass-Balance Equations, Charge-Balance Equations, or Proton-Balance Equations) to calculate the pH of the following:
a. 0.050 M NaH₂PO₄
b. 0.050 M Na₂HPO₄
c. 0.050 M Na₃PO₄

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