A concentrated aqueous solution of Pb(NO3)2 is slowly added to 1.0 L of a mixed aqueous solution containing 0.010 M Na2CrO4 and 2.5 M NaBr in an attempt to selectively precipitate only one of the anions. The sparingly soluble salt that precipitates first (neglecting any volume change) is with a [Pb2+] concentration of .
Ksp(PbCrO4) = 1.8 × 10–14, Ksp(PbBr2) = 6.3 × 10–6
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