Effect of NiCl2•6H2O and CoCl2•6H2O on the viscosity of aqueous ethanol mixtures

The viscosity of transition metal chlorides (CoCl, and NiCl2) in aqueous ethanol mixtures (10% to 50% (v/v)) was measured in the concentration range ((1.0 to 8.0). 10(-2)) mol.dm(-3) at different temperatures ((30 to 50) degrees C) with an interval of 5 degrees C. It was found that the viscosities increase with an increase in the concentration of the salts and percent composition of ethanol mixtures. An increase in temperature results in a decrease in the viscosities. Ion-ion and ion-solvent interactions were studied on the basis of the Jones-Dole equation. The values of the A and B coefficients increase (also irregular), with an increase in the salt percent composition of the ethanol mixtures and temperature. Negative values of the B coefficient show that the ion-solvent interaction is small and suggest that cobalt chloride and nickel chloride behave as structure breakers in the aqueous ethanol system. An attempt was also made to determine the energy of activation. It decreases with an increase in the concentration of salt and increases with an increase in percent composition of the ethanol mixtures.