2.盐效应 Ⅰ增大,y减小,[S上=“,溶解度增大 K ASp=[MJA="M"aA K K M/A 3.酸效应 沉淀为弱酸盐时,aA大,溶解度增加 CaC 0=Ca2++C02 H SS=|C2O42'1 S2=[Ca2+IIC2042-"]=Ks=Ksp,a C204(H)2. 盐效应 3. 酸效应 M A 0 sp K = a ⋅ a CaC2O4 = Ca2+ + C2O42- S S =[C2O42-' ] H+ S2 = [Ca2+] [C2O42-' ] = Ksp '= Ksp · α C2O4 2- (H) 0 sp M A 0 sp M A M A sp [M][A] K a a K K > ⋅ = ⋅ ⋅ = = γ γ γ γ γ a I 增大， 减小 ， γ [ S ] = ，溶解度增大 沉淀为弱酸盐时,αA(H) 大 , 溶解度增加