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Thermodynamics of Alloxan solubility in various solvents at different temperatures

机译:四氧嘧啶在不同温度下在各种溶剂中的溶解度的热力学

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The solubility of Alloxan in methanol, ethanol, ethane-1, 2 diol, water, acetone and tetrahydrofuran was measured by gravimetric method over a temperature range (293.15 to 323.15) K at atmospheric pressure. The solubility increases non-linearly with temperature in all the studied solvents. Further, in protic solvents, solubility is maximum in methanol and minimum in ethane-1, 2 diol whereas in the selected non protic solvents, solubility is greater in tetrahydrofuran than in acetone. The experimental data were correlated with modified Apelblat and Buchowski-Ksiazczak equations. The calculated results show good agreement with the experimental data. Some thermodynamic parameters such as dissolution enthalpy, Gibb’s free energy, and entropy of mixing have also been calculated. The evaluated thermodynamic parameters are found to be positive. The positive enthalpy and Gibb’s free energy indicate endothermic and spontaneous dissolution of compounds. The positive entropy suggests entropy-driving dissolution process.
机译:在大气压力下于293.15至323.15K的温度范围内通过重量分析法测量了四氧嘧啶在甲醇,乙醇,乙烷-1、2-二醇,水,丙酮和四氢呋喃中的溶解度。在所有研究的溶剂中,溶解度均​​随温度呈非线性增加。此外,在质子溶剂中,在甲醇中的溶解度最大,在乙烷-1、2二醇中的溶解度最小,而在所选的非质子溶剂中,四氢呋喃的溶解度大于丙酮。实验数据与修正的Apelblat和Buchowski-Ksiazczak方程相关。计算结果与实验数据吻合良好。还计算了一些热力学参数,例如溶解焓,吉布的自由能和混合熵。发现所评估的热力学参数为正。正焓和吉布的自由能表示化合物的吸热和自发溶解。正熵表明熵驱动溶解过程。

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