Standard molar enthalpy of formation of rubidium diphosphate
Rubidium carbonate (Rb 2 CO 3 ) and ammonium dihydrogen phosphate (NH 4 H 2 PO 4 ) were used for synthesizing rubidium diphosphate (Rb 4 P 2 O 7 ). The purity of the latter compound was checked up by X-ray diffraction. Rb 4 P 2 O 7 was involved in an hypothetical reaction and dissolved together with...
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| Veröffentlicht in: | Journal of thermal analysis and calorimetry 2014-10, Vol.118 (1), p.579-583 |
|---|---|
| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | Rubidium carbonate (Rb
2
CO
3
) and ammonium dihydrogen phosphate (NH
4
H
2
PO
4
) were used for synthesizing rubidium diphosphate (Rb
4
P
2
O
7
). The purity of the latter compound was checked up by X-ray diffraction. Rb
4
P
2
O
7
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 (Rb
4
P
2
O
7
). 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. |
|---|---|
| ISSN: | 1388-6150 1588-2926 |
| DOI: | 10.1007/s10973-014-4023-9 |