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Citation: Chu De-Ying, Zhang Ying, Hu Jing-Dan, Liu Rui-Lin. Excess Molar Volumes of Mixtures of N,N-Dimethylformamide and Water and Apparent Molal Volumes and Partial Molal Volumes of N,N-Dimethylformamide in Water From 278.15 K to 318.15 K[J]. Acta Physico-Chimica Sinica, ;1990, 6(02): 203-208. doi: 10.3866/PKU.WHXB19900214 shu

Excess Molar Volumes of Mixtures of N,N-Dimethylformamide and Water and Apparent Molal Volumes and Partial Molal Volumes of N,N-Dimethylformamide in Water From 278.15 K to 318.15 K

1.
Department of Chemistry, Peking University

Received Date: 8 August 1988
Available Online: 15 April 1990

The densities of the mixtures of N,N-Dimethylformamide (DMF) and water(w) have been measured at ten temperatures from 278.15 K to 318.15 K with the vibra-tingtube density meter(Anton Paar Model DMA602). Then the excess molal volumes V~E of solutions and apparent and partial molal volumes of DMF over the range of mole fraction 0-1 have been determined. Comparing these quantities as functions of mole fraction of mixtures with the standard entropies of transfer for NaCl from water to DMF-H_2O mixtures as function of mole fraction of mixed solvent we found out there is a correspondence between the V_(DMF) varied with x and the standard entropies of transfer of NaCl. Both have the extremes at x=0.075. Therefore the structure of solution have been discussed. It might be considered that monomeric DMF molecules have been trapped in a quasi-clathrate "cage" made up of 12 water molecules at x=0.075 forming the possible closest packing of particles.
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