Effects of CuCl2·6H2O and ZnCl2·6H2O on the viscosity of aqueous ethanol mixtures
A.Rasheed KHAN 1Fahim UDDIN 2Rehana SAEED 3Mahjabeen MUKHTAR2
作者信息
- 1. Department of Chemistry, Federal University of Science&Technology,Gulshan-e-Iqbal Campus,Karachi,Pakistan
- 2. Department of Chemistry, University of Karachi, Karachi, Pakistan
- 3. Department of Chemistry, Federal University of Science & Technology,Gulshan-e-Iqbal Campus, Karachi, Pakistan
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Abstract
The effects of CuCl2 and ZnCl2 on the viscosity in aqueous ethanol mixtures (10％-50％ v/v) were studied in the concentration range 1.0 × 10-2-8.0 × 10-2 mol· dm-3at different temperatures. It was found that the viscosities increased with an increase in the concentration of the salts and percent composition of ethanol content, whereas it decreased with an increase in temperature. Ion-ion and ion-solvent interactions are determined with the help of A- and B-coefficients of Jones-Dole equation. The values of A- and B-coefficients are irregular and increase with a rise in temperature and also with an increase in ethanol contents for both salts. Negative values of B-coefficients show that ion solvent interactions is comparatively small and suggest that CuCl2 and ZnCl2 behave as structure breakers in aqueous ethanol mixtures. Thermodynamic parameters like the energy of activation (Eη) and change in entropy of activation (△S*) were also evaluated which confirm the structure breaker behavior of salts in aqueous ethanol mixtures.
Key words
viscosity/Jones-Dole equation/ionic interactions/transition metal chlorides/thermodynamic parameters引用本文复制引用
出版年
2011
NETL
NSTL
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