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 pKa values for phosphoric acid (pKa1 = 7.5 x 10-3, pKa2 = 6.2 x 10-8, pKa3 = 4.2 x 10-13) what is the Kb value for the PO43- 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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