Hydrolysis of cupric chloride in aqueous ammoniacal ammonium chloride solutions
DOI:
https://doi.org/10.3989/revmetalm.1995.v31.i3.961Keywords:
Solubility, Cupric diammine chloride, Cupric hydroxychloride, Ammoniacal ammonium chloride solutionsAbstract
Cupric solubility in the CuCl2-NH4Cl-NH3-H2O system for chloride concentrations lower than 4 molal in the temperature range 25-60 °C was studied. The experimental results show that for chloride concentration between 3.0 and 1.0 molal the cupric solubility is determined by the solubility of the cupric hydroxychloride Cu(OH)1.5Cl0.5. For a chloride concentration value of 4.0 molal, there are two cupric compounds, the hydroxychloride Cu(OH)1.5Cl0.5 or the diammine chloride Cu(NH3)2Cl2, on which the solubility of Cu(II) depends, according to the temperature and the value of the ratio [NH3]Total/[Cu]Total.
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