Calculate the equilibrium concentration (in M) of PO43− that would be present in a mixture that is originally 0.015 M H3PO4 as well as 0.005 M NaH2PO4, given the following information: H3PO4(aq) ↔ H+(aq) + H2PO4−(aq) Ka1 = 1.5 x 10−5 H2PO4−(aq) ↔ H+(aq) + HPO42−(aq) Ka2 = 2.5 x 10−7 HPO42−(aq) ↔ H+(aq) + PO43−(aq) Ka3 = 3.5 x 10−9

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Answered: Calculate the equilibrium concentration…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter21: Chemistry Of The Nonmetals

Section: Chapter Questions

Problem 43QAP

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Calculate the equilibrium concentration (in M) of PO₄³⁻ that would be present in a mixture that is originally 0.015 M H₃PO₄ as well as 0.005 M NaH₂PO₄, given the following information:

H₃PO₄(aq) ↔ H⁺(aq) + H₂PO₄⁻(aq) K_a₁ = 1.5 x 10⁻⁵

H₂PO₄⁻(aq) ↔ H⁺(aq) + HPO₄²⁻(aq) K_a₂ = 2.5 x 10⁻⁷

HPO₄²⁻(aq) ↔ H⁺(aq) + PO₄³⁻(aq) K_a₃ = 3.5 x 10⁻⁹

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