Excess volumes of ethanoic, propanoic and butanoic acids with 1,2-dichloroethane and 1,2-dibromoethane

Abstract

A survey of the literature has shown that many attempts have been made to measure excess volumes for mixtures of haloalkanes with l-alkanols (7 ,2 ) , l-alkanes ( 3 , 4 ) , aromatic hydrocarbons (5, 6), and ketones (7,-70) and of cyclohexane with an acid ( 7 7 ) . But no attempt has been made to measure the excess volumes of aliphatic carboxylic acids with haloalkanes. Aliphatic carboxylic acids are ail associated in the pure state through intermolecular hydrogen bonding. Dilution of such liqukls with polar solvents like haloalkanes is expected to bring about dissociation of dimers and polymers of acids and formation of intermolecular hydrogen bonds between unlike molecules. With a view to study the effect of these hydrogen-bond interactions between unlike molecules on VE we have measured excess volumes for the systems 1,2dichloroethane and 1,2dlbromoethane with ethanoic, propanoic, and butanoic acids at 303.15 K.