A solution is 1 X 10 -4 M in NaF, Na 2S, and Na3PO4. What would be the order of precipitation as a source of Pb2+ is added gradually to the solution? The relevant Ksp values are Ksp(PbF2) = 4 X 10 -8, Ksp(PbS) = 7 X 10 -29, and Ksp[Pb3(PO4)2] = 1 X 10 -54.
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