Closed safe and continuous type sodium combustion reaction demonstrative experiment device

Abstract

The invention discloses a closed safe and continuous type sodium combustion reaction demonstrative experiment device which comprises a base, a supporting rod, a rotary locator, a hard glass test tube, drying tubes and aluminum foil. The demonstrative experiment device is characterized in that the rotary locator is arranged on the supporting rod and connected with a flask clamp, the hard glass test tube is arranged on the flask clamp, the arc aluminum foil is arranged in the hard glass test tube, sealing plugs are arranged at the two ends of the hard glass test tube respectively, the calcium oxide drying tubes are connected to the two ends of the sealing plugs respectively, and one drying tube is connected with an inlet valve which is connected with an oxygen conveying device. A demonstrative experiment is carried out in a dry air environment without carbon dioxide, and a sodium combustion experiment and a sodium peroxide chemical property experiment are continuously completed in one glass tube; after experiments are completed, the hard glass test tube can be dismounted and cleaned conveniently, is not prone to damage and can be recycled; the experiment effect is visual and obvious, experiment phenomena are real and vivid, and observation angles are flexible and diversified.

Description

technical field [0001] The invention relates to the field of chemical experiment devices, in particular to an airtight and safe continuous sodium combustion reaction demonstration experiment device. Background technique [0002] Chemical experiments play a role in linking theory with practice in teaching. Reasonable and effective experimental content and experimental phenomena not only enhance the intuition and image of teaching, stimulate students' interest in learning, but also train students to analyze and solve problems through the experimental process. and the ability to conduct scientific research. In order to ensure that the experimental phenomena in the classroom demonstration are consistent with the content introduced in the textbook, the key lies in the design of the experimental device to be scientific, reasonable and effective. The textbooks used in the study of alkali metal elements all introduce the physical and chemical properties of sodium to students as the...

AI Technical Summary

Problems solved by technology

According to the method introduced in the textbook, it is difficult to observe the yellow experimental phenomenon of sodium combustion.

Because the air contains water vapor and carbon dioxide, pure sodium peroxide cannot be obtained when sodium is burned in the air, and students cannot realize the process from perceptual knowledge to rational knowledge of the physical and chemical properties of sodium peroxide

The products generated by the combustion of metal sodium in the combustion spoon are very easy to corrode the combustion spoon under high temperature conditions, making the combustion spoon difficult to clean and damage, and the generated combustion products are not easy to recycle

The existing experimental methods mainly have the following deficiencies: (1) It is difficult to observe the yellow flame presented by sodium combustion in the combustion experiment of sodium in a metal combustion spoon; (2) the combustion process is exposed to the air, and usually cannot Pure sodium peroxide cannot further test the chemical properties of sodium peroxide; (3) Due to the presence of water vapor and carbon dioxide in the air, students cannot observe the existence of light yellow particles of sodium peroxide; (4) Combustion produces The product is easy to corrode the combustion spoon under high temperature conditions, making the combustion spoon difficult to clean and easy to damage; (5) The combustion product is pasty at high temperature and solid at low temperature and firmly adheres to the spoon, making the combustion product unable to be recycled and utilized ;(6) The combustion process of sodium is in an exposed state, and the sparks and combustion products generated are extremely high in temperature, which are easy to splash and cause injury, and the safety performance is poor during classroom demonstrations; (7) The smoke generated by combustion causes serious pollution to the indoor environment;( 8) In order to increase the experimental effect and carry out the follow-up property test of the product sodium peroxide, the amount of metal sodium is often relatively large, resulting in long burning time and high test cost. In addition, another test tube needs to be taken for the follow-up test of sodium peroxide. , the operation is cumbersome; (9) The overall experimental effect is not obvious and not intuitive

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