Viscosity and Thermodynamic Properties of Alkali Metal Bromides in the Presence of Acetonitrile, 3-Hydroxypropionitrile and Acetonitrile + 3-Hydroxypropionitrile Mixture at Various Temperatures – Pages 133-150

Viscosity and Thermodynamic Properties of Alkali Metal Bromides in the Presence of Acetonitrile, 3-Hydroxypropionitrile and Acetonitrile + 3-Hydroxypropionitrile Mixture at Various Temperatures – Pages 133-150

Shama1, Fahim Uddin1, Tehseen Ahmed1 and Talat Zamir2

1Department of Chemistry University of Karachi, Pakistan; 2Department of Chemistry University of Balochistan, Quetta, Pakistan

http://dx.doi.org/10.6000/1927-5129.2013.09.20

Abstract: Excess molar volume VEm, energy of activation ΔEν, Gibbs energy change ΔG and entropy change ΔS have been investigated for this study density and viscosity measurements of Acetonitrile (AN), 3-hydroxypropionitrile (3-HPN) and 50% mixture of AN + 3-HPN and alkali metal bromides (Li,Na,K,Rb and Cs)Br in AN, 3-HPN and 50%AN+3-HPN over the concentration range (0.01 – 0.05 mol.dm-3) at temperature range (298 to 323 K) were used. On the basis of Jones-Dole Equation the viscosity B-coefficient and the thermodynamic, activation parameters for viscous flow of solutions have been evaluated. The B-coefficient values of LiBr, NaBr , KBr, RbBr and CsBr are positive and decreases by increasing the temperature. The B-coefficient values are positive in protic and aprotic solvents. The positive values reveal that electrolytes behave as structure maker.

Keywords: Jones–Dole coefficient A and B, Excess molar volume, Energy of activation, Gibbs energy change and Entropy change.

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