Preparation and Analysis of K3 Fe

Many metal ions form complexes with oxalate ions. These are generally anionic complexes, in which the oxalate is coordinated to the metal by its two oxygens ie it acts as a bidentate or chelate ligand. Thus the complexes are stabilised by the chelate effect. 

Iron(III) forms a trisoxalato-complex which can be precipitated as the potassium salt, by mixing FeCIs solution with K2C2O4 solution  

The complex is high spin and is expected to exhibit optical isomerism. 

Weigh your product and calculate the percentage yield based on oxalate. The solid and its solution are sensitive to light and should be stored in dark glass. 

Oxalato-complexes of metals, when heated with H2SO4, generally react with KMn04 solution and can be titrated with standardised KMn04  

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TABLE 15.1. Data for preparation and analysis of K3[Fe(C2O4)3] 3H2O. 

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