Viscosity and thermodynamic properties of alkali metal bromides in the presence of acetonitrile, 3-hydroxypropionitrile and acetonitrile + 3-hydroxypropionitrile mixture at various temperatures. | [Journal of Basic and Applied Sciences • 2013]

Author(s):

1. Shama: Department of Chemistry, University of Karachi, Pakistan

2. Fahimuddin: Department of Chemistry, University of Karachi, Pakistan

3. Tehseen Ahmed: Department of Chemistry, University of Karachi, Pakistan

4. Talat Zamir: Department of Chemistry, University of Balochistan, Quetta, Pakistan

Abstract:

Excess molar volume , energy of activation ?Ev , Gibbs energy change ?G and entropy change ?S 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.

Page(s): 133-150

DOI: DOI not available

Published: Journal: Journal of Basic and Applied Sciences, Volume: 9, Issue: 0, Year: 2013

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