Answered: 9. Using the reaction HPO42– + 2H+ +…

9. Using the reaction HPO42– + 2H+ + 2e– ⇌ HPO32–+ H2O(l) E°= –0.234 V And the Ka values below, calculate E° for H2PO4– + H+ + 2e– ⇌ HPO32– + H2O(l) E°= ??? V

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter5: Equilibrium, Activity And Solving Equations

Section: Chapter Questions

Problem 10P

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Question

Show your work, use general chemistry rules for significant figures.

9. Using the reaction

HPO₄^2– + 2H⁺ + 2e^– ⇌ HPO₃^2–+ H₂O_(l) E°= –0.234 V

And the Ka values below, calculate E° for

H₂PO₄^– + H⁺ + 2e^– ⇌ HPO₃^2– + H₂O_(l) E°= ??? V

H₃PO₄: pK_a1 = 2.148; pK_a2 = 7.198; pK_a3 = 12.375

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