lect5_exp25b

lect5_exp25b - Chemistry 123 Dr. Woodward Separation of...

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Unformatted text preview: Chemistry 123 Dr. Woodward Separation of Group II Cations Separation of Group II Cations Pb Pb 2+ 2+ Bi Bi 3+ 3+ Cu Cu 2+ 2+ Sb Sb 3+ 3+ /Sb /Sb 5+ 5+ Sn Sn 2+ 2+ /Sn /Sn 4+ 4+ The group II cations are The group II cations are separated from all other separated from all other cations by forming acid cations by forming acid insoluble sulfide salts. insoluble sulfide salts. Pb Pb 2+ 2+ (aq) (aq) + 2HS + 2HS (aq) (aq) PbS PbS (s) (s) + H + H + (aq) (aq) 2Bi 2Bi 3+ 3+ (aq) (aq) + 3HS + 3HS (aq) (aq) Bi Bi 2 S S 3 (s) (s) + 3H + 3H + (aq) (aq) Cu Cu 2+ 2+ (aq) (aq) + HS + HS (aq) (aq) CuS CuS (s) (s) + H + H + (aq) (aq) SnCl SnCl 6 2 2 (aq) (aq) + 2HS + 2HS (aq) (aq) SnS SnS 2 (s) (s) + 4H + 4H + (aq) (aq) + 6Cl + 6Cl (aq) (aq) 2SbCl 2SbCl 6 (aq) (aq) + 5HS + 5HS (aq) (aq) Sb Sb 2 S S 5 (s) (s) + 5H + 5H + (aq) (aq) + 12Cl + 12Cl (aq) (aq) Chemistry 123 Dr. Woodward Pb 2+ , Bi 3+ , Cu 2+ , Sb 3+ , Sb 5+ , Sn 2+ , Sn 4+ HNO 3 + HCl (Aqua regia) Pb 2+ , Bi 3+ , Cu 2+ , SbCl 6 1 , SnCl 6 2 HNO 3 acts as an oxidizing agent Cl acts as a complexing agent Removes excess acid, be careful not to overdo it....
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lect5_exp25b - Chemistry 123 Dr. Woodward Separation of...

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