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Densities, Specific Heat Capacities, Apparent and Partial Molar Volumes and Heat Capacities of Glycine in Aqueous Solutions of Formamide, Acetamide, and N,N-Dimethylacetamide at T=298.15 K and Ambient Pressure

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Abstract

Apparent molar volumes (V 2,φ ) and heat capacities (C p2,φ) of glycine in known concentrations (1.0, 2.0, 4.0, 6.0, and 8.0 mol⋅kg−1) of aqueous formamide (FM), acetamide (AM), and N,N-dimethylacetamide (DMA) solutions at T=298.15 K have been calculated from relative density and specific heat capacity measurements. These measurements were completed using a vibrating-tube flow densimeter and a Picker flow microcalorimeter, respectively. The concentration dependences of the apparent molar data have been used to calculate standard partial molar properties. The latter values have been combined with previously published standard partial molar volumes and heat capacities for glycine in water to calculate volumes and heat capacities associated with the transfer of glycine from water to the investigated aqueous amide solutions, \(\Delta\overline{V}_{\mathrm{2,tr}}^{\mathrm{o}}\) and \(\Delta\overline{C}_{p\mathrm{2,tr}}^{\mathrm{o}}\) respectively. Calculated values for \(\Delta\overline{V}_{\mathrm{2,tr}}^{\mathrm{o}}\) and \(\Delta\overline{C}_{p\mathrm{2,tr}}^{\mathrm{o}}\) are positive for all investigated concentrations of aqueous FM and AM solutions. However, values for \(\Delta\overline{C}_{p\mathrm{2,tr}}^{\mathrm{o}}\) associated with aqueous DMA solutions are found to be negative. The reported transfer properties increase with increasing co-solute (amide) concentration. This observation is discussed in terms of solute + co-solute interactions. The transfer properties have also been used to estimate interaction coefficients.

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  1. Department of Chemistry & Biochemistry, The University of Lethbridge, 4401 University Drive, Lethbridge, Alberta, Canada, T1K 3M4

    Mohammad M. H. Bhuiyan, Andrew W. Hakin & Jin Lian Liu

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  1. Mohammad M. H. Bhuiyan
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Bhuiyan, M.M.H., Hakin, A.W. & Liu, J.L. Densities, Specific Heat Capacities, Apparent and Partial Molar Volumes and Heat Capacities of Glycine in Aqueous Solutions of Formamide, Acetamide, and N,N-Dimethylacetamide at T=298.15 K and Ambient Pressure. J Solution Chem 39, 877–896 (2010). https://doi.org/10.1007/s10953-010-9540-y

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