苯、水、乙醇三元相图绘制的改进  

Improvement of the drawing trihedral phase diagram of benzene,water and ethyl alcohol

作　　者：黄晨宇 方知临 陈瑞涛[1] 孙彦璞[1] 

机构地区：[1]宁夏大学化学化工学院,宁夏银川750021

出　　处：《实验室科学》2016年第4期58-61,共4页Laboratory Science

摘　　要：根据苯、水、乙醇三元相图的实验方法,实验中苯的用量始终保持2.00m L不变,因此随着水的不断滴加,苯相对于水的含量逐渐减小会出现由清变浊现象越来越不明显、不易确定滴定终点即相变点的问题,同时滴定终点即相变点也比较少。为此提出了简单易行的改进方法,将苯、乙醇或苯、水以不同比例混合,在二者保持不同比例的情况下,分别用水或乙醇滴定至混合物由清变浊或由浊变清,不仅可以避免上述问题的出现,同时可以增加滴定的终点便于相图的准确绘制。Based on experimental method of benzene,water and ethyl alcohol drawing phase diagram, the amount of benzene is always remain in 2. 00mL,when a certain amount of water is dropped con-stantly ,because of decreasing relative the proportion of benzene to water during the experiment,there will be some problem, such as experimental phenomena of clear to indistinct will become more and more unobvious, the titration end point namely the phase point is not ensure to determine easily, meanwhile,the titration end point is relatively little. So a simple and easily method is proposed,we can titrate differently with water or ethanol until the mixture to becomes clear from indistinct or indis-tinct to become clear in the case of maintaining the mixture of benzene and ethanol or benzene and wa-ter in the different proportions, and thus the problems that mentioned above can be avoided, mean-while titration end point can be increased and convenient for drawing the phase diagram.

关 键 词：部分互溶 完全互溶 三元相图 

分 类 号：O64[理学—物理化学]