-1-5-2(1)不正确,二者为不同类型的难溶电解质,虽然其溶度积均近似为10-9,但Pb2+浓度和Ca2+浓度并不相等。(2)不正确,所有含PbSO4固体的溶液中,c(Pb2+)c(SO42-)=1.6×10-8,但c(Pb2+)与c(SO42-)不一定相等。5-4解:2244211()()(210)(2210)3.210spKcCacF5-55-7-2-5-105-12解:22211172221()()/()2.710/(2.010)6.7510()spcCaKCaFcFmolL22331122321()()/()2.810/6.75104.1410()spcCOKCaCOcCamolL5-14-3-5-16