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QUALITATIVE ANALYSIS FOR CATIONS<br />
Separation of Subgroup II Cations<br />
The addition of H2S(aq) in 0.3 M H3O+(aq) forms a precipitate of the sulfides of Hg2+ and Cu2+. The sulfides of subgroups III and IV are soluble in 0.3 M H3O+(aq). The remaining mixture of CuS(s) and HgS(s) is separated by a reaction with hot HNO3(aq).

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QUALITATIVE ANALYSIS FOR CATIONS
Separation of Subgroup II Cations
The addition of H2S(aq) in 0.3 M H3O+(aq) forms a precipitate of the sulfides of Hg2+ and Cu2+. The sulfides of subgroups III and IV are soluble in 0.3 M H3O+(aq). The remaining mixture of CuS(s) and HgS(s) is separated by a reaction with hot HNO3(aq).

Copyright:© 1983 Chip Clark - Fundamental Photographs

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