VII Treatment of the precipitate from Procedure VI The precipitate which

Vii treatment of the precipitate from procedure vi

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VII.Treatment of the precipitate from Procedure VI VIII.Treatment of the residue from Procedure VII X.Treatment of the solution from Procedure VII
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Figure 1. Preparation of the setup Pb 2+ , Cu 2+ , Bi 3+ , Sn 2+ , and Hg 2+ solution 10 drops of H 2 O 1M NH 4 OH 6M HCl 10 drops of thioacetamide solution Indirect heating for 5 minutes 1 mL H 2 O Pb 2+ , Cu 2+ , Bi 3+ , Sn 2+ , and Hg 2+ solution 5 drops of 4M HNO 3 Direct heat Pb 2+ , Cu 2+ , Bi 3+ , Sn 2+ , and Hg 2+ Supernatant 12 drops of 4M NaOH 4 drops of thioacetamide solution Indirect heating for 5 minutes Centrifugation 12 drops of 4M NaOH 4 drops of thioacetamide solution Indirect heating for5 minutes Centrifugation Pb 2+ (s) , Cu 2+ (s) , and Bi 3+ (s) Sn 2 and Hg 2+ solution Pb 2+ (s) , Cu 2+ (s) , and Bi 3+ (s) Sn 2+ and Hg 2+ solution Combined solution
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Figure 2. Presence of Pb 2+ , Bi 3+ , and Cu 2+ Test Pb 2+ (s) , Cu 2+ (s) , and Bi 3+ (s) 1 mL H 2 O and 2 drops of 1M NH 4 OH solution Centrifugation Pb 2+ (s) , Cu 2+ (s) , and Bi 3+ (s) Supernatant 15 drops of 6M HNO 3 Indirect heating to remove the sulfides 5 drops of 4M H 2 SO 4 Indirect heating to remove SO 3 fumes 1 mL of H 2 O Indirect heating PbSO 4(s) Cu 2+ and Bi 3+ solution 5 drops of 1M NH 4 CH 3 CO 2 1 drop of CH 3 COOH 1 drop of K 2 CrO 4 PbCrO 4(s) Yellow Precipitate 15M NH 4 OH Cu 2+ solution Bi(OH) 3(s) 15 drops of hot water Sodium stannite solution Black Precipitate CH 3 COOH 0.1M K 4 Fe(CN) 6 Cu 2 Fe(CN) 6 Red-Pink Precipitate Presence of Pb 2+ Presence of Bi 3+ Presence of Cu 2+
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Sn 2 and Hg 2+ solution 6M HCl Indirect heating Sn 2+ (s) and Hg 2+ (s) Supernatant 1 mL of 6M HCl Indirect heating Centrifugation Hg 2+ (s) Sn 2+ (l) 15 drops of 6M HCl Indirect heating Centrifugation Hg 2+ (s) Sn
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