旋光度法测蔗糖水解反应速率常数实验的热力学探究  

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

作　　者：于少芬 赵倩 何有清 刘刚[1] 宋其圣[1] 苑世领[1] Shaofen Yu;Qian Zhao;Youqing He;Gang Liu;Qisheng Song;Shiling Yuan(School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China;High School Attached to Shandong Normal University,Jinan 250014,China)

机构地区：[1]山东大学化学与化工学院,济南250100 [2]山东师范大学附属中学,济南250014

出　　处：《大学化学》2021年第4期203-211,共9页University Chemistry

基　　金：山东大学教育教学改革项目(2020Y229)。

摘　　要：旋光法测蔗糖水解速率常数是大学物理化学实验中非常经典的化学动力学实验之一。本文对该实验项目进行了深入讨论,探讨了蔗糖水解体系旋光度的加和性、蔗糖水解反应的可逆性以及温度对可逆反应平衡的影响,验证了当前实验教学中将蔗糖水解反应近似为一级反应、忽略蔗糖水解反应的可逆性、蔗糖完全水解溶液的实验条件等内容,拓展了蔗糖水解实验的教学内容,加深了学生对旋光度、化学反应级数、热力学动态平衡等知识的理解。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.

关 键 词：蔗糖水解 可逆反应 反应级数 

分 类 号：G64[文化科学—高等教育学] O6[文化科学—教育学]