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Electrical Conductance of Cu (NO3)2 with Kryptofix - 222 in Mixed ( MeOH – DMF) Solvents at Different Temperatures

DOI: 10.5923/j.ajee.20120202.02

Keywords: Kryptofix- 222 – Cu (NO3)2 – (MeOH - DMF) solvents, molar conductance, limiting molar conductance, molar solvated volume, Van der Waals volume, electrostriction volume, apparent molar volume, free en

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Abstract:

On using conductometric technique, the apparent association constant (KA) of Cu (NO3)2 were measured in mixed MeOH-DMF mixed solvents at 0, 20, 40, and 100% MeOH (by volume) and different temperatures (298.15, 303.15, 308.15 and 313.15K) in absence and presence of Kryptofix - 222[ 4, 7, 13, 16, 21, 24 – hexaoxa – 1.10 – diazo – bicycle – (8, 8, 8) Hexa cosane]. From the experimental results, the molar conductivities (∧) were calculated and limiting molar conductivites (∧0) were calculated by using Shedlovsky and Fouss – Kraus extrapolation methods. The molar solvated (∨), Van der Waals (∨w), electrostriction (∨e) and apparent molar () volumes were evaluated. The free energy of association (), free energy necessary for complexation (), enthalpy () and entropy () were determined. New equation for the calculation of association constant were used and all the results were discussed.

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