Concentration Effect of Sodium Chloride and Potassium Chloride on Enthalpies of Mixing of N-Glycylglycine with d-Mannitol in Aqueous Solutions at 298.15 K

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• 作者：Lili Wang ; Min Liu ; Guangqian Li ; Lanying Zhu ; Dezhi Sun ; Youying Di
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：September 9, 2010
• 年：2010
• 卷：55
• 期：9
• 页码：3268-3273
• 全文大小：92K
• 年卷期：v.55,no.9(September 9, 2010)
• ISSN：1520-5134

文摘

The enthalpies of mixing of N-glycylglycine with d-mannitol in aqueous sodium chloride and potassium chloride solutions have been determined by using flow-mix isothermal microcalorimetry at 298.15 K. The results, along with the enthalpies of dilution of these solutes, have been analyzed using the McMillan−Mayer theory to obtain the heterotactic enthalpic interaction coefficients (h_xy, h_xxy, and h_xyy). It has been found that the heterotactic enthalpic pairwise interaction coefficients h_xy between N-glycylglycine and d-mannitol in aqueous sodium chloride or potassium chloride solutions are negative and become less negative as the molality of sodium chloride or potassium chloride increases. The results have been interpreted from the point of view of solute−solute interactions and solvation effects.