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 1pKa1 = 7.5 * 10 - 3,
pKa2 = 6.2 * 10 - 8, pKa3 = 4.2 * 10 - 132 what is the Kb
value for the PO43 - ion?
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