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  • 1
    Electronic Resource
    Electronic Resource
    Solvation of ions, part XXX. Thermodynamics of transfer of copper ions from water to solvent mixtures (1982)
    Springer
    Journal of solution chemistry 11 (1982), S. 495-508 
    Details
    ISSN: 1572-8927
    Keywords: Thermodynamic transfer quantities ; acetonitrile ; pyridine ; 2-hydroxycyanoethane ; aqueous organic solvent mixtures ; Cu2+, Cu+, and Ag+ ions ; hydrometallurgy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Free energies and Walden products show that the Cu+ and Ag+ ions are specifically solvated by acetonitrile (AN), 2-hydroxycyanoethane (HAN), and by pyridine (Py) whereas Na+ is specifically solvated by water, in mixtures of these organics with water. The Cu2+ ion is specifically solvated by pyridine in pyridine-water mixtures, but by water in acetonitrile-water mixtures. Ion-solvent, coordinated solvent-bulk solvent, and solvent-solvent interactions produce large entropy losses in the order Cu+≫Ag+〉Na+ for transfer of these ions from water to dilute acetonitrile-water. The metallurgically important oxidations of copper, silver, CuS and Cu2 with CuSO4 in water are strongly favored in an enthalpic and free energy sense by the addition of acetonitrile, but addition of acetonitrile also produces a large loss of entropy for the reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647111
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemistry of copper in aqueous acetonitrile (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 757-774 
    Details
    ISSN: 1572-8927
    Keywords: Cu(II)/Cu(I) couple ; Cu(I)/Cu(0) couple ; acetonitrile-water mixtures ; Fe(III) ; 2-hydroxycyanoethane ; electrochemistry ; voltammetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrochemical characteristics of the Cu (II)/Cu (I) and the Cu (I)/Cu (0) couples at platinum, carbon, mercury and copper have been studied in acetonitrile-water (AN-H2O) mixtures. All the electrode processes are moderately fast with mercury the fastest but slower on platinum and carbon paste in that order. A slow chemical step precedes oxidation of Cu (I) to Cu (II) on allectrodes in solutions of high AN content. The slow step may be partial removal of AN from the solvated Cu (I) ion prior to electron transfer. Electrode processes are faster in chloride ions than in sulfate ion solutions. Reduction of Cu (I) in AN−H2O is quite slow on glassy carbon. Adsorption of AN on platinum and carbon influences the processes. Diffusion coefficients in sulfate solutions are in the order, Cu (I) (AN−H2O)〉Cu (II)(AN−H2O)〉Fe (III)(H2O) and 2-hydroxy-cyanoethane (2-HCE) strongly decreases the mobility of Cu (I) when added to H2O. The relevance of the measurements to hydrometallurgical processes is considered. CuSO4 in 30% v/v AN−H2O is a ‘faster’ oxidant than the common oxidant Fe2(SO4)3 in H2O because of the greater mobility and faster electron acceptance from a corroding surface of Cu (II). Only in solutions of very high nitrile content is the reduction potential of CuSO4 as high as that of Fe2(SO4)3 in H2O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649487
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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