Abstract
Measurements of electrical conductivity of NaCl ∶ 10−5 molar fr. CaCl2 ∶ (1–80)×10−5 molar fr. Na2CO3 crystals have been used to determine the temperature dependence of the solubility of CO3-ions over the temperature range from 75 to 530 °C. The total solubility of CO3-ions and that of [CO32−-vacancy] complexes may be expressed by simple relationships\(c_{CO_3 } = 2 \cdot 16 \times 10^{ - 2} \,\exp ( - 0 \cdot 23eV/kT)\) andcka=3·19× 10−2 exp (−0·25 eV/kT), resp. The heat of solution of complexes is equal to 0·25 eV and that of free CO32− ions is higher than 1·2 eV. Under conditions of the thermal equilibrium between the solid solution and precipitate, the ratio of Na2CO3 and CaCO3 components in the precipitate has been calculated at various temperatures and CO3 concentrations.
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