Answered: Phosphoric acid (H3PO4) has 3…

Phosphoric acid (H3PO4) has 3 dissociable protons with the pKa values shown. Which form of phosphoric acid predominates in a solution at pH 4? Explain. Acid pKa H3PO4 2.14 H2PO4- 6.86 HPO42- 12.4

General, Organic, and Biological Chemistry

7th Edition

ISBN:9781285853918

Author:H. Stephen Stoker

Publisher:H. Stephen Stoker

Chapter10: Acids, Bases, And Salts

Section: Chapter Questions

Problem 10.38EP: Using the diagrams shown in Problem 10-37, which of the four acids is the weakest acid?

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Question

Phosphoric acid (H₃PO₄) has 3 dissociable protons with the pK_a values shown. Which form of phosphoric acid predominates in a solution at pH 4? Explain.

Acid pK_a

H₃PO₄ 2.14

H₂PO₄^- 6.86

HPO₄^2- 12.4

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