Abstract
Rubidium carbonate (Rb2CO3) and ammonium dihydrogen phosphate (NH4H2PO4) were used for synthesizing rubidium diphosphate (Rb4P2O7). The purity of the latter compound was checked up by X-ray diffraction. Rb4P2O7 was involved in an hypothetical reaction and dissolved together with the other components in a 3.85 % (m/m) phosphoric acid solution, using a C-80 SETARAM calorimeter. Mixing processes were also realized in the calorimeter in order to get the standard molar enthalpy of formation of rubidium diphosphate (Rb4P2O7). For that a thermochemical cycle was investigated and the obtained value for the standard molar enthalpy of formation of rubidium diphosphate is (−3,183.7) kJ mol−1. The result is about 1.8 % lower than literature value.
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