Reactii complexonometrie

Reactii complexonometrie:

1) calciu- murexid

Ca²⁺ + H₂Ind^3- + 2HO¯ D CaInd^3- + 2H₂O

CH₂ COONa CH₂ COONa

CH₂- N CH₂- N

Ca²⁺ + CH₂ COOH + 2OH¯D CH₂ COO - Ca

CH₂ COOH CH₂ COO +2H₂O

CH₂- N CH₂- N

CH₂ COONa CH₂ COONa

CaInd^3- + H₂Y^2- D CaY^2- + H₂Ind^3-

2) Metoda 1- murexid +negru eriocrom : Determinarea Ca⁺² si a Mg⁺² in amestec

Ca²⁺ + H₂Ind^3- + 2HO¯ D CaInd^3- + 2H₂O

CH₂ COONa CH₂ COONa

CH₂- N CH₂- N

Ca²⁺ + CH₂ COOH + 2OH¯D CH₂ COO - Ca

CH₂ COOH CH₂ COO +2H₂O

CH₂- N CH₂- N

CH₂ COONa CH₂ COONa

CaInd^3- + H₂Y^2- D CaY^2- + H₂Ind^3-

Mg²⁺ + HInd^2- + OH^- D MgInd^- + H₂O

CH₂ COONa CH₂ COONa

CH₂- N CH₂- N

Mg²⁺ + CH₂ COOH + 2OH¯D CH₂ COO - Mg

CH₂ COOH CH₂ COO +2H₂O

CH₂- N CH₂- N

CH₂ COONa CH₂ COONa

MgInd^- + H₂Y^2- + OH^- D MgY^2- + HInd^2- + H₂O

3) Metoda 2 - negru eriocrom: Determinarea Ca⁺² si a Mg⁺² in amestec si duritate totala

Mg²⁺ + HInd^2- + OH^- D MgInd^- + H₂O

CH₂ COONa CH₂ COONa

CH₂- N CH₂- N

Mg²⁺ + CH₂ COOH + 2OH¯D CH₂ COO - Mg

CH₂ COOH CH₂ COO +2H₂O

CH₂- N CH₂- N

CH₂ COONa CH₂ COONa

MgInd^- + H₂Y^2- + OH^- D MgY^2- + HInd^2- + H₂O

Ca²⁺ + HInd^2- + OH^- D CaInd^- + H₂O

CH₂ COONa CH₂ COONa

CH₂- N CH₂- N

Ca²⁺ + CH₂ COOH + 2OH¯D CH₂ COO - Ca

CH₂ COOH CH₂ COO +2H₂O

CH₂- N CH₂- N

CH₂ COONa CH₂ COONa

CaInd^- + H₂Y^2- + OH^- D CaY^2- + HInd^2- + H₂O