Thermodynamic study of (m1Cs2SeO4+m2NiSeO4)(aq)wheremdenotes molality atT= 298.15 K

Thermodynamic study of aqueous sodium and potassium chloride and chromate systems at the temperature 298.15 K

“…(11,12) Different mass ratios of sodium and potassium chlorides and chromates were used for each experiment. Crystal salts in excess of the solubilities at T = 298.15 K were mixed with water.…”

“…(9,10,18) The simulation has been performed as follows: determination of the Pitzer binary parameters β (0) , β (1) , and C φ taking into account the ionic interactions of two ions and three ions; determination of the Pitzer ternary parameters {θ(MN) and (MNX)} characterizing the interaction between two different ions of the same sign (MN) and the interaction between three ions (MNX, MMX and NNX), respectively; and calculation of the solubility isotherms of the three-component solutions. The same scheme has been used to simulate other ternary (11,12,19) and multicomponent solutions (9,10) from which phases with a constant stoichiometric composition (simple or double salts) crystallize.…”

“…The solubility isotherms of the ternary solutions at T = 298.15 K are calculated on the basis of the thermodynamic parameters obtained. A method described in previous papers (9)(10)(11)(12)19) has been used. The calculated and experimental solubility isotherms are presented in figures 1 and 2.…”

Thermodynamics of formation of double salts and mixed crystals from aqueous solutions

“…In order to calculate the thermodynamic characteristics of the double salt crystallizing from the saturated ammonium sulfate ternary solutions, we have applied the scheme used successfully in references [29,31,44,56]. The theoretical basis of the adopted approach has been presented in a previous study [56].…”

“…Note that in constructing the mixed solutions {m 1 FeSO 4 + m 2 Fe 2 (SO 4 ) 3 }(aq) and {m 1 K 2 SO 4 + m 2 Fe 2 (SO 4 ) 3 }(aq) model [65] the pure electrolyte Al 2 (SO 4 ) 3 (aq) parameters from references [57,59] are accepted as an approximation for ferric sulfate binary parameters {valid up to %1 mol kg À1 of Fe 2 (SO 4 ) 3 }. Simulation of the binary solutions of alkali selenates and sodium bichromate was performed on the basis of experimental osmotic coefficients data obtained by us using the isopiestic method [24,26,36,37,56,61]. The comprehensive description of the isopiestic method for determination of a w , and/or / is given in references cited above.…”