A.8.6×10-9 B.9.3×10-5 C.1.9×10-6 D.9.6×10-2
A.Ksp=[Fe3+][S2-] B.Ksp=[Fe23+][S32-] C.Ksp=[Fe3+]2[S2-]3 D.Ksp=[2Fe3+]2[3S2-]3
A.H2O B.Na2CO3溶液 C.KNO3溶液 D.酒精