Chem. J. Chinese Universities

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Dilution Enthalpies of Formamide in Aqueous Ethylene Glycol Solutions

WANG Xu, XU Li, ZHANG Rui, LIN Rui-Sen   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China
  • Received:2005-08-09 Revised:1900-01-01 Online:2006-09-10 Published:2006-09-10
  • Contact: LIN Rui-Sen

Abstract: The dilution enthalpies of formamide in aqueous ethylene glycol solutions were determined by using a CSC-4400 isothermal calorimeter at 298.15 K. The homogeneous enthalpic interaction coefficients in the range of ethylene glycol mass fraction(0%—40%) were calculated according to the excess enthalpy concept. The results show that enthalpic pair interaction coefficients h2 of formamide are negative in aqueous ethylene glycol solutions and pass through a minimum at w≈0.20 of ethylene glycol in mixed solvents.

Key words: Formamide, Ethylene glycol, Dilution enthalpy, Enthalpic pair interaction coefficient, Structural interaction

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