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STUDY THE VOLUMETRIC BEHAVIOURS AND VISCOSITY OF DIBROMO ACETIC ACID IN THIOUREA-WATER MIXTURES | ||
| Iraqi journal of mechanical and material engineering | ||
| Article 1, Volume 9, Issue 3, 2009, Pages 348-358 | ||
| Author | ||
| Dunya Edan Al- Mammar | ||
| Abstract | ||
| The investigation envolved determination of the partial molar volumes at infinite dilution of the dibromo Acetic acid in the thiourea- water mixtures at five temperatures in the range 293.15-313.15 K and at five compositions in the range 5 to 30 percent by weight thiourea, the concentration of the acid in each solvent mixture covered the rang 10-3 to 0.4 mol dm-3. Densities and viscosities of thiourea-water have been measured at each temperature for all thiourea-water mixtures as well as for solutions of dibromo acetic acid. The concentration dependence of densities of dibromo acetic acid solution have been used to estimate the partial molar volumes. The volumetric behaviours of thiourea-water have been investigated in terms of excess molar volume. The variation of the relative excess molar volume of mixture was found to be due to a volume contraction (negative )on mixing the constituents of the mixture. The results were rationalized in terms of the two models for liquied water; one maximally hydrogen-bonded and voluminous the other non-hydrogen-bonded and dense. The thermodynamic activation parameters ( ) for the ion flow in thiourea-water could be estimated from the dependence of viscosity on temperature . the presence of dibromo acetic acid in thiourea-water mixture did not influence sigificanlty the values of these thermodynamic activation parameters. The dependence of dynamic viscosities (ηr) values on the concentrations (c) of dibromo acetic acid in thiourea-water have been determined, electrolytic solutions of moderate concentration generally have relative dynamic viscosities (ηr) which obey the empirical equation of Jone and Dole. | ||
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