Densities and Excess Volumes for PEG 200 and PEG 400 with Nitrobenzene at Different Temperatures

Abstract

Densities, excess volumes for PEG 200 + nitrobenzene and PEG 400 + nitrobenzene at three different temperatures have been studied. Excess volumes (V^E) are calculated over entire range of compositions at three different temperatures using the standard equation. The data are fitted in to empirical equation V^E/X₁X₂ = [a + b(2X₁ – 1) + c(2X₁ – 1)²] and constants 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 solvents is discussed in the light of hydrogen bonding.