Gallium selenates

The enthalpies of dissolution of Ga2(Se04)3-18H20(cr) and Ga2(Se04)3(cr) in 0.2 M KOH were also measured. These measurements yield  

The enthalpies of formation reported in [68TAN/GOR] are -7401.1 and - 1978.2 kJ-moP respectively. An analysis of the evaluation there shows that the difference from the present results is mainly caused by the different selections of the standard enthalpy of formation of BaSe04(cr), see Appendix A. The values calculated by the review are adopted, although the experimental difficulties with highly hydrated salts are well known. This matter is further discussed in Appendix A, [68TAN/GOR]. Since the calculation of the formation enthalpies from the experiments involved non-TDB auxiliary data, they are included in Appendix E. 

---

Bol shakova, N. K., Heats of formation and thermal stability of neutral gallium selenates, Izv. Akad. Nauk SSSR, Neorg. Mater., 4, (1968), 2124-2128, in Russian, English translation in... 

Selenaboranes, 4 204 Selenac, 22 73t Selenate alums, 22 89 Selenates, 22 88, 89 gallium, 12 359 Selenazole uses of, 22 102 Selenazole derivatives uses of, 22 102... 

Standard heats of formation of some gallium selenites and hydrogen selen-ites have been derived from heats of reaction of the salts with 20% HCl. 

---