Apparent molar volumes and apparent molar heat capacities of aqueous solutions ofN,N- dimethylformamide andN,N- dimethylacetamide at temperatures from 278.15 to 393.15 K and at the pressure 0.35 MPa |
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| Affiliation: | 1. Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, PR China;2. School of Pharmacy, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu 212013, PR China;1. College of Chemistry, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Nankai University, Tianjin 300071, China;2. College of Chemistry and Biology Engineering, Hechi University, Yizhou 546300, China;3. National Demonstration Center for Experimental Chemistry Education (Nankai University), Tianjin 300071, China;4. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116011, China |
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| Abstract: | Apparent molar heat capacities Cp, φand apparent molar volumesVφ were determined for aqueous solutions of N, N - dimethylformamide andN , N - dimethylacetamide at temperatures from 278.15 to 393.15 K and at the pressure 0.35 MPa. The molalities investigated ranged from 0.015 mol ·kg − 1to 1.0 mol · kg − 1. We used a vibrating-tube densimeter (DMA 512P, Anton PAAR, Austria) to determine the densities and volumetric properties. Heat capacities were obtained using a twin fixed-cell, power-compensation, differential-output, temperature-scanning calorimeter (NanoDSC 6100, Calorimetry Sciences Corporation, Spanish Fork, UT, U.S.A.). The results were fit by regression to equations that describe the surfaces (Vφ,T , m) and (Cp, φ, T, m). Infinite dilution partial molar volumes V2oand heat capacitiesCp,2o were obtained over the range of temperatures by extrapolation of these surfaces to m = 0. |
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