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Citation: LIU Min, ZHU Lan-Ying, LI Bin, ZHAO Qiang, SUN De-Zhi, LIN Rui-Sen. Thermodynamics of Dilution of N,N-Dimethylformamide in Aqueous Sodium Chloride Solutions at Different Concentrations[J]. Acta Physico-Chimica Sinica, ;2008, 24(07): 1316-1320. doi: 10.3866/PKU.WHXB20080734 shu

Thermodynamics of Dilution of N,N-Dimethylformamide in Aqueous Sodium Chloride Solutions at Different Concentrations

1.
College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, Shandong Province, P. R. China; College of Life Science and Bioengineering, Liaocheng University, Liaocheng 252059, Shandong Province, P. R. China; Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China

Received Date: 29 December 2007
Available Online: 12 May 2008

The dilution enthalpies of N,N-dimethylformamide (DMF) in pure water and aqueous sodium chloride solutions were determined by using flow microcalorimetry at 298.15 K. The homogeneous enthalpic interaction coefficients in the range of sodium chloride concentration from 0 to 0.6 mol·kg-1 were calculated according to the McMillan-Mayer theory. It was found that enthalpic pairwise interaction coefficients (h2) of DMF were all positive in aqueous sodium chloride solutions and became larger with increasing the concentration of sodium chloride. The results were discussed in terms of the solute-solute and solute-solvent interactions.
- N,N-dimethylformamide; Sodiumchloride; Dilution enthalpy; Enthalpic pairwise interaction coefficient
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