The solubility of aqueous lead chloride solutions |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2. Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, Hunan, China |
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| Abstract: | Data are presented for the solubility of lead in acidic solutions of between 5 and 10 M chloride concentration, present as the salts of copper (II) and either sodium or calcium. Cooling these solutions from boiling point to 20°C precipitates approximately two thirds of the lead as PbCl2 crystals of >99% purity. The solubility of PbCl2 is shown to depend upon the activity of the lead and chloride ions in solution, and can be predicted from known thermodynamic constants. This has been tested for solutions containing only one cation, other than lead, at 25°C. This approach accurately predicts the lead solubility in solutions of calcium chloride but needs improving before it can be applied to sodium chloride solutions and hydrochloric acid. |
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