Densities and Excess Volumes of Binary Liquid Mixtures of PEG 200, PEG 400 and PEG 600 with Toluene at Three Temperature

Abstract

Densities for the systems PEG 200 + toluene, PEG 400 + toluene and
PEG 600+ toluelne at three different  temperatures have been studied. Excess
volumes (V^E) are calculated over the entire range of composition at
three different temperatures using the standard relation. The data are fitted
into an empirical equation.
V^E = X₁X₂[a + b(2X₁ - 1) + c(2X₁ - 1)²]
and the values of constants a, b and c are evaluated by the least squares
method along with standard deviation σ. The marked reduction in (V^E)
with increase in C—C chain length of PEG has been studied in the light
of interaction phenomena.