Before precipitation of group III cations, the solution is boiled with cone, nitric acid. If H2S is not boiled off then it would react with HNO3 and would be oxidized to colloidal ...
Before precipitation of group III cations, the solution is boiled with cone, nitric acid. If H2S is not boiled off then it would react with HNO3 and would be oxidized to colloidal ...