Densities and excess molar volumes of formic acid, acetic acid and propionic acid in pure water and in water + Surf Excel solutions at different temperatures
Densities and excess molar volumes of formic acid, acetic acid and propionic acid in pure water and in water + Surf Excel solutions at different temperatures
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DOI：
10.1080/00319100500074707
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发表时间：
2005-06
影响因子：
1.2
通讯作者：
M. Motin;M. Kabir;E. M. Huque
中科院分区：
文献类型：
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作者：
M. Motin;M. Kabir;E. M. Huque
分别在303.15、308.15、313.15、318.15和323.15 K下测量了甲酸、乙酸和丙酸在水中以及在0.05%和0.1%Surf Excel（SE）水溶液中的体系的密度ρ，覆盖了整个组成范围。过量摩尔体积，为系统被发现是负的，其值被发现与羧酸的链长增加。将密度和过量摩尔体积与溶质的摩尔分数（X2）作图.所有这些性质都已用适当的多项式满意地表示出来。在所研究的体系中加入0.05%和0.1%的表面活性剂，密度和过量摩尔体积没有明显的变化。本文试图从溶质的疏水水合作用和亲水作用两个方面来解释。从溶质的疏水水化作用和亲水作用两个方面对这一现象进行了解释.
Densities, ρ of the systems formic acid, acetic acid and propionic acid in water and in 0.05% and 0.1% Surf Excel (SE) solutions in water were measured at temperatures 303.15, 308.15, 313.15, 318.15 and 323.15 K respectively covering the whole composition range. Excess molar volumes, for the systems were found to be negative and their values were found to increase with chain length of carboxylic acid. Densities and excess molar volumes have been plotted against mole fraction of the solutes (X 2). All these properties have been expressed satisfactorily by appropriate polynomials. No appreciable change of the densities and excess molar volumes were observed by the addition of surfactant (0.05% and 0.1%) to the studied systems. An attempt has been made to explain in terms of hydrophobic hydration and hydrophilic effect of the solutes. An explanation of in terms of hydrophobic hydration and hydrophilic effect of the solutes is offered.