Cation Group II Copper Arsenic group
group consisting of arsenic antimony and tin The group reagent precipitating agent of cation group ll is hydrogen sulphide in acid medium M HCl Thioacetamide may also be used; it is hydrolysed in acid solution to give hydrogen sulphide CH 3 CSNH 2 H 2 O H 2 S CH 3 COONH 4 Thioacetamide H 2 S 2H S2 Group II cation Page 65 The real significance of the [H ] as a control of