Thermal decomposition of potassium bis-oxalatodiaquaindate(III) monohydrate

Indium (III) is precipitated with oxalic acid in the presence of potassium nitrate maintaining an overall concentration of 0.125 M in HNO3, Chemical a nalysis of the complex salt obtained indicates the formula, K[In(C2O4)(2)]. 3H(2)O. Thermal decomposition studies show that the compound decomposes fi rst to the anhydrous potassium indium oxalate and then to the final mixture of the oxides through formation of potassium carbonate and indium(III) oxi de as intermediates. Isothermal study, X-ray diffraction pattern and IR spe ctral data support the proposed thermal decomposition mechanism.