... ] Hg22+ Cu2+ Bi3+ Cd2+ Pb2+ Mercury(I) Copper Bismuth Cadmium Lead III Ammonium sulfide [ (NH4)2S ] Co2+ Ni2+ Fe2+ Fe3+ Cr3+ Al3+ Zn2+ Mn2+ Cobalt(II) Nickel(II) Iron(II) Iron(III) Chromium(III) Aluminium Zinc Manganese(II) IV Ammonium carbonate [ (NH4)2CO3 ] Ca2+ Sr2+ Ba2+ Calcium Strontium Barium V Not specified* Mg2+ Na+ K+ NH4+ Magnesium Sodium Potassium Ammonium SEPERATION AND IDENTIFICATION OF CATIONS IN MIXTURES We started by testing for ammonium ions. It was necessary to do it now because most of the group reagents are added to the sample in the form of ammonium compounds thus during the analysis a considerable amount of ammonium ions is introduced into the test solution. I added solid sodium hydroxide to the sample and heated the test tube containing the sample. The characteristic stench of ammonia was absent. Also the litmus paper didn't turn blue when it was hold near the test tube(without touching it). NH4Cl + NaOH › NH3ˆ + NaCl + H2O Ammonia ions weren't present in the sample First day of laboratories - separation and identification of cations of GROUP 1("silver" group) To separate first group I added a few drops of HCl to the cold solution of the sample. The white ...

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