Dependence of Eutectic - Composition on Densities of Components of Binary Eutectic Mixtures of Solid Carboxylic Acids

Abstract

At eutectic point the composition was richer with that component which had lower density in comparison to the component of higher density, namely; Malonic acid(50%)-Succinic acid(50%) -stoichiometric ratio1:1, Malonic acid(40%)-Benzoic acid(60%) -stoichiometric ratio2:3, Succinic acid(30%)-Benzoic acid(70%) -stoichiometeic ratio 1:2.3, Salicylic acid(50%)-Malonic acid(50%) -stoichiometric ratio1:1, Salicylic acid(30%)-Benzoic acid(70%) -stoichiometric ratio 1:2.3, Benzoic acid(70%)-Oxalic acid(30%)-stoichiometric ratio 2.3:1.Components with similar densities were having stoichiometric ratio 1:1 whereas components with different densities were having different stoichiometric ratios and at the eutectic point the component with lower density could accommodate the other component with higher density into its empty sites, that's why at eutectic point the component with lower density was found to be present in higher proportions in comparisons to the other component with higher density. In this way, after mixing, the components were present in the free spaces of each other due to which old strong forces get weakened to the maximum extent and hence melting point of the eutectic mixture became lowest.