The concentration of Pb2+ in an aqueous solution is 5.5 x 10-3 M. What concentration of SO42- is required to begin precipitating PbSO4? The Ksp of PbSO4 is 2.5 x 10-8.
(a) 1.4 x 10-10 M
(b) 4.5 x 10-6 M
(c) 1.6 x 10-4 M
(d) 8.3 x 10-4 M
(e) 2.9 x 10-2 M
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