Salts containing the phosphate ion are added to municipal water supplies to prevent the corrosion of lead

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Salts containing the phosphate ion are added to municipal water supplies to prevent the corrosion of lead pipes.

(a) Based on the pK_a values for phosphoric acid (pK_a1 = 7.5 x 10^-3, pK_a2 = 6.2 x 10^-8, pK_a3 = 4.2 x 10^-13) what is the K_b value for the PO₄^3- ion?

(b) What is the pH of a 1 x 10^-3 M solution of Na₃PO₄ (you can ignore the formation of H₂PO₄^- and H₃PO₄)?

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Chemistry The Central Science

ISBN: 978-0134414232

14th Edition

Authors: Theodore Brown, H. LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward, Matthew Stoltzfus

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Question Posted: Nov 29, 2022 06:34 AM

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Salts containing the phosphate ion are added to municipal water supplies to prevent the corrosion of lead

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a The Kb value for an ion is related to its pKa value through the relationship Kb 10pKa The pKa valu...View the full answer

Chemistry The Central Science

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