Experiment demonstration device of copper and concentrated nitric acid reaction

Abstract

The invention provides an experiment demonstration device of a copper and concentrated nitric acid reaction. The device mainly comprises a transparent plastic shell injector (1), a transparent plastic shell injector (2), a connecting flexible pipe (3), a fixing iron clamp (4) and a fixing support (5). The device is characterized in that: the transparent plastic shell injector (1) is vertically fixed on the fixing iron clamp (4), and the transparent plastic shell injector (1) and the transparent plastic shell injector (2) are connected by a connecting flexible pipe (3). The device has the following advantages: (1) a method of operating the copper and concentrated nitric acid reaction in a sealed device is employed, a reaction rate can be controlled, the reaction can be stopped at any time, the overflow of a toxic gas nitrogen dioxide is not prevented, and the method is safe and environmentally friendly; (2) a life material or a waste material beside a student is taken as a test material, which is in accordance with the spirit of the new curriculum reform, an experimental exploration desire of the student can be simulated, and a saving consciousness is reflected; (3) operation is simple, materials are easy to obtain, and experiment cost is saved.

Description

Technical field [0001] The invention relates to a teaching demonstration tool, and relates to a teaching demonstration device for safely demonstrating the reaction experiment of copper and concentrated nitric acid. Background technique [0002] At present, the existing devices in the textbook have the following shortcomings: On the one hand, the experimental operation of the reaction between copper and concentrated nitric acid in the textbook is to add copper chips to the test tube, and then add 1-2ml of concentrated nitric acid to the test tube. The reaction proceeded immediately. The reaction was violent and difficult to control. During the experiment, the toxic gas nitrogen dioxide would be released, which would endanger human health. On the other hand, the treatment of nitrogen dioxide is not reasonable enough. In the textbook, a cotton ball dipped in sodium hydroxide solution is used to plug the mouth of the test tube. This method can only absorb a certain amount of nitrogen...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing devices in the teaching materials have the following disadvantages: On the one hand, the experimental operation of the reaction between copper and concentrated nitric acid in the teaching materials is to add copper flakes to the test tube, and then add 1-2ml of concentrated nitric acid to the test tube

The reaction proceeds immediately, the reaction is violent, and it is difficult to control. The experimental process will release toxic gas nitrogen dioxide, which is harmful to human health

On the other hand, the treatment of nitrogen dioxide is not reasonable enough. In the textbook, a cotton ball dipped in sodium hydroxide solution is used to plug the test tube mouth. This method can only absorb a certain amount of nitrogen dioxide, and it will also cause nitrogen dioxide to overflow

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