Thermodynamic properties of the silver ion in alcohol + water solvent mixtures from electromotive force measurements and thermodynamic solubility product constants of AgX (X = Cl,Br, I or CNS) at different temperatures |
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Authors: | Upendra Nath Dash Banka Behari Das Uttam Kumar Biswal Tapodhan Panda Narendra Kumar Purohit Dushmanta Kumar Rath Shubhankar Bhattacharya |
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Institution: | Department of Chemistry, Bhadrak College, Bhadrak 756100 India |
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Abstract: | The standard potentials of the silver-silver ion electrode in alcohol+water solvent mixtures containing 10 and 20 wt% methanol, ethanol, 1-propanol and 2-propanol have been determined from the electromotive force measurements of the cell Ag(s), AgCl(s), NaCl(c), NaNO3(c)// NaNO3(c), AgNO3(c), Ag(s) at seven different temperatures in the range 5–35°C. The standard potentials in each solvent have been represented as a function of temperature. The standard thermodynamic functions for the electrode reaction, the primary medium effects of various solvents upon Ag+, and the standard thermodynamic quantities for the transfer of 1 g-ion of Ag+ from water to the respective alcohol + water media have been evaluated and discussed in the light of ion-solvent interactions as well as the structural changes of the solvents. From the values of the standard potentials of the Ag/Ag+ and Ag/AgX, X? electrodes, the thermodynamic solubility product constants of silver chloride, silver bromide, silver iodide and silver thiocyanate have been determined in alcohol + water solvent mixtures at different temperatures. |
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