Abstract
Extracation of copper(II) with capric acid in several inert solvents was carried out at 25°C and at aqueous ionic strength of 0.1 M(NaClO 4). Organic solvents used are n-hexane, cyclohexane, carbon tetrachloride, toluene, benzene, chlorobenzene, 1,2-dichloroethane. In these solvents dimeric copper caprate being responsible for the extraction, the extraction equilbrium is written as: 2 Cu 2 + 3( HR) 2,0 ⇌ ( CuR 2HR ) 2,0 + 4H + . The following extraction constants were obtained: log K ex = −11.88±0.03 for n-hexane, −11.67±0.03 for cyclohexane, −11.61±0.03 for carbon tetrachloride, −11.57±0.03 for toluene, −11.36±0.03 for benzene, −11.30±0.03 for chlorobenzene and −11.10±0.03 for 1,2-dichloroethane. The extraction constant has been related with the solubility parameter of the solvents.
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