Question
H2S is bubbled into a 0.2 M NaCN solution which is, 0.02 M each in Ag(CN)⊝2 and (Cd(CN)4)2−. If Ksp of Ag2S and CdS are 10−50 and 7.1×10−28 and K instability for [Ag(CN)⊝2] and [Cd(CN)2−4] are 1.0×10−20 and 7.8×10−18, which sulphide will precipitate first?