沉淀溶解度平衡的计算公式

AgCl<===>Ag+ + Cl- Ksp=8*10^-10

[Ag+]*[Cl-]=Ksp,[Ag+]=[Cl-]

[Ag+]=2.8*10^-5(mol/L)

CaF2<===>Ca2+ + 2F- Ksp=2.7*10^-11

[Ca2+]*[F-]^2=Ksp,[F-]=2[Ca2+]

[Ca2+]=1.9*10^-4(mol/L)

MgNH4PO4<===>Mg2+ + NH4+ + PO4^3- Ksp=2.5*10^-13

[Mg2+]*[NH4+]*[PO4^3-]=Ksp,[Mg2+]=[NH4+]=[PO4^3-]

[Mg2+]=6.3*10^-5(mol/L)

所以CaF2溶解度最大,AgCl溶解度最小