PROCEDURE OF PREPERAYION OF POTASSIAM FERRIC OXALATE

The complex can be obtained by reaction between iron(III) sulfate, barium oxalate and potassium oxalate:

Fe2(SO4)3 + 3 BaC2O4 + 3 K2C2O4 → 2 K3[Fe(C2O4)3] + 3 BaSO4 

The reactants are consolidated in water, the strong accelerate of BaSO4 is expelled, and the green trihydrate takes shape from the cooled arrangement. 

Another method is responding fluid iron(III) chloride hexahydrate and potassium oxalate monohydrate. Channel the strong utilizing channel paper and a Büchner pipe and recrystallize the item to evacuate impurities. 

FeCl3·6H2O + 3 K2C2O4•H2O → K3[Fe(C2O4)3]·3H2O + 3 KCl + 6 H2O