Al(OH)3, Cr(OH)3, Fe(OH)3, NiS, CoS, MnS, ZnS

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Al(OH)3, Cr(OH)3, Fe(OH)3, NiS, CoS, MnS, ZnS SUPERNATANT A: (Fe3+, Al3+, Cr3+, Mn2+, Zn2+ ) dark green color Co +2 Transfer to a clean test tube 10 drops of HNO3 pinches of spatula sodium bismuthate (NaBiO3) from the side of the tube PRECIPITATE A: CoS, NiS III. GROUP CATIONS 20 drops of sample 10 drops of 4 M NH4Cl Dropwise 2 M NH4OH check the basicity of the solution with a litmus paper. 20 drops of NH4OH eklenir. Heat the solution for 5 min at water bath and add 20 drops of thioacetamide solution COMMON PRECIPITATE Al(OH)3, Cr(OH)3, Fe(OH)3, NiS, CoS, MnS, ZnS Wash several times with 0.1 M NH4Cl Add 20 drops of 6 M HCl Centrifuge and separate the supernatant A and the precipitate A. aken into cruicible, heated on bunsen burber till the solute part evaporates 20 drops of aqua regia (15 drops of 6 M HCl + 5 drops of 6 M HNO3) to dissolve the precipitate. Add 2 M NH4OH check the basicity with red litmus paper. 2 drops of 6 M NaOH 2 drops of dimethyl glyoxime Add 0.1 M (K4[Fe(CN)6]) SUPERNATANT C: Cr3+, Zn2+ Violet color, Mn2+ white aluminum hydroxide (Al(OH)3) 2 drops of thioacetamide solution heat it up in the water bath with stirring for 5 minutes until the white precipitate is visible. 20 drops 2 M CH3COOH pinches of spatula of sodium acetate (NaCH3COO) Heat the solution in a water bath for 20 min add 2 drops of 0.5 M barium chloride (BaCl2) solution to the hot solution. 20 drops of 6 M NaOH 20 drops of 3% H2O2 Centrifuge and separate supernatant B and the precipitate B. PRECIPITATE B Fe(OH)3, MnO2 20 drops of HNO3 add NH4OH until it is basic. Centrifuge and separate the supernatant C and the precipitate C SUPERNATANT B: Zn2+, Al3+, Cr3+ 10 drops of 0,1 M (K4[Fe(CN)6]) rose color Ni +2 prussian blue precipitate Fe3+ PRECIPITATE C PRECIPITATE D Yellow precipitate barium chromate BaCrO4 SUPERNATANT D dirty white precipitate ZnS Divide the sample into two