Experimental device for measuring chemical reaction rate and activation energy

Abstract

The invention discloses an experimental device for measuring chemical reaction rate and activation energy. The experimental device comprises a reaction container with a cover plate, wherein the reaction container is positioned on a magnetic stirrer; a reaction tube with a bottom is arranged in the reaction container; the upper end of the reaction tube is arranged on the cover plate, and the bottom of the reaction tube is suspended; a lifting movable separator is arranged in the reaction tube, so that the reaction tube is divided into a left reaction area and a right reaction area; a water bath area is formed in an area between the reaction container and the reaction tube; a water bath area water outlet is formed in the lower part of the water bath area; a reaction area water outlet is formed in the lower part of the reaction tube; two charging openings which correspond to the two reaction areas, a gas collection port which corresponds to any reaction area, and a water bath area water inlet are respectively formed in the cover plate; chargers are respectively arranged on the two charging openings; the gas collection port is connected with a gas collection device. The experimental device can accurately measure the chemical reaction rate and activation energy and is low in medicine consumption, simple in structure, convenient to operate and low in manufacturing cost.

Description

technical field [0001] The invention relates to a chemical experiment device, in particular to an experimental device for measuring chemical reaction rate and activation energy, and belongs to the field of chemical experiments. Background technique [0002] The determination of chemical reaction rate and activation energy is an important teaching experiment content in inorganic chemistry experiments and university chemistry experiments. In the course of experimental teaching, the reaction rate of potassium iodate and sodium sulfite in acidic solution is generally measured, and the reaction order, rate constant and activation energy of the reaction are calculated. [0003] In acidic solution, KIO 3 with NaSO 3 The equation for the reaction is: [0004] IO 3 - +3SO 3 2- =3SO 4 2- +I - [0005] Its step-by-step reaction is: [0006] IO 3 - +SO 3 2- = SO 4 2- +IO 2 - [0007] IO 2 - +2SO 3 2- =2SO 4 2- +I - [0008] 6H + +IO 3 - +5I - =3H 2 O+3I...

AI Technical Summary

Problems solved by technology

As a student experiment, there are mainly the following problems: ①The amount of glass instruments used is large, and the damage rate of the instruments is high. Students often damage the thermometer and large test tubes during the process of oscillating the reaction system; ②The mixing process of the two solutions is slow and requires manual operation. The oscillating reaction system affects the effective mixing of the reaction solution and the uniformity of the reaction system, resulting in experimental errors; ③The experimental process uses a large beaker as a water bath, which has poor heat preservation effect. In addition, it is inconvenient to operate in the water bath during the oscillating process, and students often leave the water bath to oscillate , leading to experimental errors; ④The reaction temperature is replaced by the temperature of the reaction system by measuring the temperature of the water bath, and the water bath layer does not take insulation measures, which affects the accuracy of the experimental results; Change the water bath once to adjust the temperature of the water bath layer, which is a serious waste; ⑥The amount of drug used in the experiment is relatively large (the average drug is 50ml / each experimental point, 10 experimental points are needed to complete the experiment, and the total amount of drug used is 500ml), and the waste of drugs is serious; ⑦The chemical pollution is serious , The reaction process of potassium iodate and sodium sulfite produces elemental iodine, which causes a large amount of iodine elemental volatilization, which seriously damages the health of teachers and students and pollutes the environment

Therefore, the existing chemical reaction rate and activation energy measurement experiment cannot enable students to obtain accurate and reliable experimental data, the operation is cumbersome, the dosage is large, and there is still a certain amount of chemical pollution.

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