The thermal dehydration/decomposition of CaC2O4-H2O, which exhibits a three-step thermal dehydration/decomposition to form CaO via CaC2O4 and CaCO3, is used as a standard for thermogravimatry (TG). Although the reliable thermodynamic parameters are needed for the interpretation of the kinetic behavior, I cannot find them for anhydrous CaC2O4 in any database. I would be very glad if you could provide a reliable thermodynamic parameters for this compound, including standard molar entropy and specific heat capacity.
Dear Koga,
This data is from the HSC Chemistry 6.0 software. I hope you find it useful.
Regards
However, I noticed that the first decomposition step does not generate negative deltaG values with this data. This is strange since the reaction is obviously feasible with temperature, its deltaG value should be negative. Therefore, I would take this data with a grain of salt (although the source is supposed to be reliable).
Dear Prof. Resentera,
Thank you very much for your kind help. However, the thermodynamic parameters for CaC2O4 in HSC Chemistry 6.0 are similar to those for the monohydrate. In other databases, DfH and S for CaC2O4-H2O are -1675 kJ/mol and 156.5 J/(mol-K), respectively.
Best regards,
Nobi
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