US EPA

8171233 

Journal Article 

Effect of temperature on partial molar volumes of some bivalent transition metal chlorides and magnesium chloride in the water-rich region of binary aqueous mixtures of ethanol 

Thakura, RC; Singh, S 

2014 

0 

Research Journal of Pharmaceutical, Biological and Chemical Sciences
ISSN: 0975-8585 

5 

6 

1298-1305 

English 

Partial molar volumes of five transition metal chlorides viz. manganese chloride, cobalt chloride, nickel chloride, copper chloride, cadmium chloride and magnesium chloride have been determined in water and in binary aqueous mixtures of ethanol (5%,10%,15%,20% and 35% w/w) from the solution densities at 303.15 K. The observed data has been analysed by using the Masson Equation and the obtained parameters Sv* and ϕv0 are interpreted in terms of solute-solute and solute-solvent interactions. The effect of temperature ranges from 298.15 to 318.15 K on partial molar volumes and limiting molar expansibility was also studied. In the present study, decrease in solute -solvent interactions has been noticed on increasing the content of ethanol in water. Structure making or breaking capacities of the electrolytes have been inferred from the sign, i.e second derivative of partial molar volume with respect to temperature at constant pressure. All the electrolytes have been found to act as structure makers/promoters in water as well in aqueous mixtures of ethanol. 

Ethanol+water; Partial molar volumes; Solute -solvent interactions; Structure maker; Transition metal chlorides