Ion–solvent and ion–ion interactions of sodium molybdate salt in aqueous binary mixtures of 1,4-dioxane at different temperatures

Abstract

Apparent molar volumes and viscosity B-coefficients of sodium molybdate in aqueous binary mixtures of 1,4-dioxane have been determined from density and viscosity measurements at 303.15, 313.15 and 323.15 K and at various electrolyte concentrations. Also, adiabatic compressibilities of different solutions have been determined from measurement of ultrasonic speeds of sound at 303.15 K. Experimental density data were evaluated using the Masson equation and the derived parameters interpreted in terms of ion–solvent and ion–ion interactions. Partial molar volumes () and viscosity B-coefficients (ΔB) of transfer from water to aqueous 1,4-dioxane mixtures have also been calculated and discussed. The structure-making or breaking capacity of the electrolyte under investigation has been discussed in terms of the sign of .

Keywords:

• 1,4-Dioxane
• Sodium molybdate
• Partial molar volumes
• Viscosity B-coefficients
• Adiabatic compressibility
• Ion–solvent and ion–ion interactions
• Electrostriction

Acknowledgements

The authors are grateful to the Departmental Special Assistance Scheme under the University Grants Commission, New Delhi (No 540/6/DRS/2002, SAP-1) for financial support. One of the authors (V.K.D.) is also grateful to CSIR (New Delhi) under University of North Bengal, Darjeeling for sanctioning a Junior Research Fellowship and providing financial aid in support of this research work.