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Environmental impact - heavy metals answers

1. (a) [Pb2+(aq)] = [CO32−(aq)] = √(7.40 x 10−14) = 2.72 x 10−7 mol dm−3so concentration of lead(II) carbonate at 298 K = 2.72 x 10−7 mol dm−3Mr(PbCO3) = (207.2 + 12.01 + 48.00) = 267.21[PbCO3] = 267.21 x (2.72 x 10−7) = 7.27 x 10−5 g dm−3(b) Ksp = [Pb2+(aq)] x [CO32−(aq)]If sodium carbonate is added, [CO32−(aq)] increases, so Pb2+(aq)] must decrease by a corresponding amount to keep Ksp constant....

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