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prof.Goran Poš

PETA GRUPA KATJONA. prof.Goran Poš. Odvajanje i dokazivanje katjona V analiti čke grupe. Reakcije dokazivanja V analitičke grupe. Ca 2+ + CO 3 2- → CaCO 3. rastvorljivi u neorganskim kiselinama i CH 3 COOH. Sr 2+ + CO 3 2- → SrCO 3. Ba 2+ + CO 3 2- → BaCO 3.

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prof.Goran Poš

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  1. PETA GRUPA KATJONA prof.Goran Poš

  2. Odvajanje i dokazivanje katjona V analitičke grupe

  3. Reakcije dokazivanja V analitičke grupe Ca2+ +CO32-→CaCO3 rastvorljivi u neorganskim kiselinama i CH3COOH Sr2+ +CO32-→ SrCO3 Ba2+ +CO32-→BaCO3 CaCO3 +2CH3COOH→Ca2+ + 2CH3COO- + H2O + CO2 SrCO3 +2CH3COOH→ Sr2+ + 2CH3COO- + H2O + CO2 BaCO3 +2CH3COOH→Ba2+ + 2CH3COO- + H2O + CO2 2Ba2+ +Cr2O72-+ H2O→2BaCrO4 + H+ Ba2+ +CrO42-→BaCrO4 2Ba2+ +Cr2O72-+ H2O + 2CH3COO-→2BaCrO4 + 2CH3COOH

  4. Ca2+ +C2O42-→CaC2O4 rastvorljivi u neorganskim kiselinama Sr2+ +C2O42-→ SrC2O4 Ba2+ +C2O42-→BaC2O4 CaC2O4 +2H+→ Ca2+ + H2C2O4 SrC2O4 +2H+→ Sr2+ + H2C2O4 BaC2O4 +2H+→ Ba2+ + H2C2O4 Reakcije suvim putem (ispitivanje u plamenu): Ca2+ Sr2+ Ba2+

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