@表山手多花 省级精品课程申报 cS042=p(Ag2Cr0)1c(Ag2=1.2×10/0.20)2=3.0×10(mol·L 计算表明，沉淀Pb2*所需的c(SO2比沉淀Ag所需的S0,2少，所以PbS04的离子积Q最先 达到溶度积而先生成白色沉淀。 (2)当加入的c(S02=3.0×10mol·L1时，AgS04才开始沉淀，此时溶液中剩余的Pb2 浓度为： c(Pb2=Kp(PbS04/c(S0,2=1.3×108/(3.0×104=4.33×10(molL 23 To improve the quality of X-ray photos in the diagnosis of intestinal disorders,the patient drinks an aqueous suspension of BaSO.however,since Bais toxic,its concentration is lowered by the addition of dilute Na2SO4.What is the solubility of BaSO in(1)pure water,(2) 0.10mo-LNa2S04.(Ksp of BaS04=1.1×100) 解(1)：BaSO4 一Ba2*(aq)+s0,2(aq S Ksp=IBa2ISO21=S2 S=√Kp=V1.1x10-0=1.05x105molL (2)BaS04—Ba2*(aq)+s0:2(aq) S0.10+S≈0.10 S=Kp(BaS0)/c(S0,2=1.1X10r10./0.10=1.1×10(mol·L