University Chemistry ›› 2021, Vol. 36 ›› Issue (4): 2005064.doi: 10.3866/PKU.DXHX202005064

• Chemistry Laboratory • Previous Articles     Next Articles

Thermodynamic Study on the Experiment of Measuring the Rate Constant of Sucrose Hydrolysis Reaction by Optical Rotation Method

Shaofen Yu1, Qian Zhao1, Youqing He2, Gang Liu1,*(), Qisheng Song1, Shiling Yuan1   

  1. 1 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
    2 High School Attached to Shandong Normal University, Jinan 250014, China
  • Received:2020-05-24 Accepted:2020-07-10 Published:2020-07-16
  • Contact: Gang Liu E-mail:sdu_lg@sdu.edu.cn

Abstract:

The optical rotation measurement of the rate constant of sucrose hydrolysis reaction is one of the very classic chemical kinetic experiments in the university physical chemistry laboratory. In this paper, the addition of the optical rotation of the sucrose hydrolysis system, the reversibility of the sucrose hydrolysis reaction, and the effect of temperature on the reversible reaction equilibrium are discussed in depth. This article verifies the approximate processing in the current laboratory teaching, such as approximating the sucrose hydrolysis reaction as a first-order reaction, ignoring the reversed reaction, and the experimental conditions for obtaining the complete hydrolysis solution of sucrose. This article expands the teaching content of the sucrose hydrolysis experiment and deepens the students' understanding of optical rotation, chemical reaction order, thermodynamic dynamic balance and other knowledge.

Key words: Sucrose hydrolysis, Reversible reaction, Reaction order

MSC2000: 

  • G64