EXCESS MOLAR VOLUMES OF AQUEOUS-SOLUTIONS OF 1-PROPANOL, 2-PROPANOL, ALLYL ALCOHOL AND PROPARGYL ALCOHOL

Excess molar volumes, V-E, have been claculated from the density data of aqueous solutions of I-propanol, 2-propanol, allyl alcohol and prop argyl alcohol at temperatures ranging from 30 degrees-50 degrees C. Th e V-E values have been found to be negative at all temperatures. The v olume contraction for saturated alcohols, both straight and branched c hain, in aqueous media is accounted for mainly by the hydrophobic effe ct, while that for unsaturated alcohols is explained primarily by the formation of H-bond between the alcohol and water. The dV(E)/dT values have been found to be positive for all alcohols. The temperature depe ndence of V-E is thought to be strongly influenced by the structural p roperties of water.