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本文用自行设计的恒温样品管,在不改变旋光仪任何部件的情况下,测定了不同温度下蔗糖转化反应的速度常数及反应的活化能,所得结果与文献值一致。化学动力学实验对化学动力学理论的形成和发展起着十分重要的作用。而做好动力学实验及准确地测定动力学数据的重要条件是恒温。对于蔗糖转化反应动力学数据的测定,目前大多采用 WZZ—1或 WZZ—T 型旋光仪,该仪器没有恒温装置,因此在实验过程中,温度的变化无法控制,处理实验数据所得的线性关系较差。这样对于学生做好实验,养成严格的科学态度,以及对于动力学研究,都是不足的。针对这一问题,我们设计制作了恒温样品管装置,摸索了实验条件,测定了不同温度下蔗糖水解反应的速度常数及反应的活化能,并验证了实验装置的可靠性。
In this paper, the temperature constant of the sucrose conversion reaction and the activation energy of the reaction were measured at different temperatures without changing any part of the polarimeter by using a thermostatic sample tube designed by ourselves. The obtained results are in accordance with the literatures. Chemical kinetics experiments play a very important role in the formation and development of chemical kinetic theory. And do a good job of kinetic experiments and accurate determination of kinetic data is an important condition of constant temperature. At present, WZZ-1 or WZZ-T type polarimeter is mostly used for the determination of kinetic data of sucrose conversion reaction. The instrument has no thermostat device. Therefore, the change of temperature can not be controlled during the experiment. The linear relation between the experimental data and the experimental data difference. This is not enough for students to experiment, develop a rigorous scientific attitude, and for kinetic studies. In response to this problem, we designed a constant temperature sample tube device, explored the experimental conditions, measured the temperature constants and reaction activation energies of sucrose hydrolysis under different temperatures, and verified the reliability of the experimental device.