Gallium selenites

Popova et al. [86POP/SLA] determined the solubility of gallium selenite in dilute nitric or perchloric acid with concordant results. The preparation and composition of the selenite is not discussed. It is assumed to have the formula Ga2(Se03)3-6H20 by the review. The solubility product calculated from the total concentration of Ga(lII) in the saturated solution is accepted and selected, cf. Appendix A. 

The uncertainty limits have been widened considerably by the review in view of the uncertainty in the values of the activity coefficients and the high powers of the activities in the expression for the solubility product. 

Tananaev, Volodina, Selivanova and Bol shakova, [76TAN/VOL], [76TANA OL2] prepared a number of gallium selenites and determined their standard enthalpies of formation from calorimetric measurements of enthalpies of dissolution in HCl(aq, 1 8). The experimental data have been re-evaluated, see Appendix A, to yield  

The recalculated values diflfer substantially from the published values for reasons discussed in Appendix A. Since the calculation of the formation enthalpies from the experiments involved non-TDB auxiliary data, they are included in Appendix E. 

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TAN/VOL4] Tananaev, I. V., Volodina, A. N., Selivanova, N. M., Bol shakova, N. K., Heats of formation of normal gallium selenites, Russ. J. Inorg. Chem., 21, (1976), 617-619. From a citation in this Bibliography... 

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. 

K. and with auxiliary data used to calculate the standard enthalpies of formation of the gallium acid selenites in Table A-102. 

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