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The co-precipitates, Ag 2 Cu(C 2 O 4 )ÁnH 2 O, of varying composition [Ag = (0.125, 0.25, 0.5, 1 and 2) %] have been prepared, identified and characterized by means of IR, XRD and SEM. The decomposition kinetics was studied by thermogravimetry at four different heating rates: 5, 10, 15 and 20 K min -1 . Decompositions of the mixed oxalates were all complex exothermic processes with resemblance to the exothermic reaction of copper oxalate. The activation energies of the thermal decomposition were calculated using model-free equations; KAS, FWO, Vyazovkin and Tang methods and the values are found to be compatible with each other. The activation energy values of the decomposition reactions obtained from FWO and Vyazovkin are slightly higher than that obtained from other methods. The kinetic analysis of copper-silver oxalates prepared shows a decrease in average activation energy with increase in the concentration of silver oxalate. E a is found to increase with extent of conversion, which indicates the complexity of the reaction.

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