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prof.Goran Poš

PRVA GRUPA KATJONA. prof.Goran Poš. Odvajanje i dokazivanje katjona I analiti čke grupe. Reakcije dokazivanja I analitičke grupe. Ag + + Cl - →AgCl. sirast. 1. Dokazivanje Ag + jona. Ag + + Br - →Ag Br. 2 Ag + + C rO 4 2 - →Ag 2 C rO 4. Pb + + 2 Cl - → Pb Cl 2. igličast.

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prof.Goran Poš

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  1. PRVA GRUPA KATJONA prof.Goran Poš

  2. Odvajanje i dokazivanje katjona I analitičke grupe

  3. Reakcije dokazivanja I analitičke grupe Ag++Cl-→AgCl sirast 1. Dokazivanje Ag+ jona Ag++ Br-→AgBr 2Ag++CrO42-→Ag2CrO4 Pb++ 2Cl-→PbCl2 igličast Pb2++2I-→PbI2 2. Dokazivanje Pb+ jona Pb2++CrO42-→PbCrO4 Pb2++SO42-→PbSO4

  4. 3. Dokazivanje Hg22+ jona Hg22++2Cl-→Hg2Cl2 Uporedne reakcije katjona Ag++Cl-→AgCl rastvoran u NH4OH, nerastvoran u HNO3 sirast Pb++ 2Cl-→PbCl2 rastvoran u toploj vodi igličast Hg22++2Cl-→Hg2Cl2 rastvoran u ccHNO3 , stajanjem prelazi u elementarnu Hg 2Ag++CrO42-→Ag2CrO4 Pb2++SO42-→PbSO4 Pb2++CrO42-→PbCrO4

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