Excess Molar Volumes of Aqueous Solutions of 1-Propanol, 2-Propanol, Allyl Alcohol and Propargyl Alcohol

Excess molar volumes, VE have been claculated from the density data of aqueous solutions of 1-propanol, 2-propanol, allyl alcohol and propargyl alcohol at temperatures ranging from 30°-50°C. The VE values have been found to be negative at all temperatures. The volume contraction for saturated alcohols, both straight and branched chain, in aqueous media is accounted for mainly by the hydrophobic effect, while that for unsaturated alcohols is explained primarily by the formation of H-bond between the alcohol and water. The dVE/dT values have been found to be positive for all alcohols. The temperature dependence of VE is thought to be strongly influenced by the structural properties of water.