Synthesis of Cobalt(II) oxalate

To a solution prepared from 2.8 g of cobalt sulfate heptahydrate in 30 mL of water, 1.6 g of sodium oxalate is added with stirring while the mixture is heated to 50°C for 5 minutes. The mixture is filtered, washed with water and the residue is dried in open air. The compound is obtained in a dihydrate form.

CoSO· 7H2O + Na2C2O4 = CoC2O· 2H2O + Na2SO4 + 5H2O

Preparation of the oxalate

The dried product

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