Excess thermodynamic properties of binary liquid mixtures of ethylene diamine + ethylene glycol
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1972
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The refraction indices of the binary liquid mixtures of ethylene diamine + ethylene glycol were measured at 25°C. Large deviations from linearity were observed in the graphical plot of refractive index versus mole fraction. The curve goes through a maximum at 55 mole percent ethylene diamine. The results of the excess volume measurements at 25°C exhibit a contraction of volume upon mixing. A graphical plot of v(superscript E) versus composition shows a minimum at the 50 mole percent region. The volume contraction in this region amounts to about 2.8 percent. The vapor pressure measurements at 25°C were made by the static method. A cathetometer was used to measure the heights of mercury in the manometer arms. As a result of experimental measurements, it was found that vapor pressure measurements could be duplicates to ±0.06 mm with this experimental apparatus. The resulting vapor pressure versus mole fraction of amine curve is rather unusual in that it shows a negative deviation from Raoult's law below 60 mole percent ethylene diamine, and a positive deviation above 60 mole percent ethylene diamine concentration. The excess Gibbs energy of mixing goes through a minimum of -26 cal mole⁻¹ at 27 mole percent ethylene diamine, and a maximum of 43 cal mole⁻¹ at 61 mole percent ethylene diamine. The excess enthalpy of mixing was measured by an adiabatic calorimeter. The mixing process was found to be highly exothermic. A graphical plot of h(superscript E) plot. The curve goes through a minimum of -1.650 cal mole⁻¹ in the vicinity of 50 mole percent ethylene diamine.
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Major chemistry