Abstract
The solubilities of NiCO3, ZnCO3, and CdCO3 in NaClO4–NaHCO3–Na2CO3 solutions are studied experimentally at 25°C and ionic strength of 0.1. The resulting data are used to determine the concentration stability constants of NiCO3 0, ZnCO3 0, and CdCO3 0 complexes in aqueous solutions (they are equal to 810, 12700, and 17900, respectively; log $$K'_{MCO_3^0 } $$ = 2.90 ± 0.14, 4.10 ± 0.20, and 4.25 ± 0.04) and to calculate their thermodynamic values (6.45 × 103, 1.01 × 105, and 1.43 × 105, respectively). The logarithms of stability constants of carbonate complexes are found to be inversely dependent on the solubility products of their metal carbonates.
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