CN210155963U

CN210155963U - Environment-friendly experimental device for measuring volume fraction of oxygen in air

Info

Publication number: CN210155963U
Application number: CN201920350138.2U
Authority: CN
Inventors: 林师龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2020-03-17
Anticipated expiration: 2029-03-20

Abstract

The utility model provides an environment-friendly experimental apparatus of oxygen volume fraction in survey air, characterized by: the device consists of an alcohol lamp (1), a test tube (3) with a groove at the bottom and filled with copper powder (2), an iron stand (4), a balloon (5), a single-hole rubber plug (6), an air duct (7), a spring clamp (8), a latex tube (9) and an injector (10). The experiment device in the textbook has the following defects: is not environment-friendly; the rubber plug is easy to be punched out; the experimental results are inaccurate. Use the utility model discloses an advantage is: the copper powder (2) is placed in the groove with the test tube (3) and is not easy to move when being heated; safe, environment-friendly and pollution-free; the balloon (5) plays a role in adjusting air pressure, and the single-hole rubber plug (6) cannot be punched out; the experimental data is more accurate.

Description

Environment-friendly experimental device for measuring volume fraction of oxygen in air

One, the technical field

The utility model belongs to a chemistry field relates to a chemistry experimental apparatus, and is specifically used for demonstrating the survey experiment of oxygen volume fraction in the air in the junior high school chemistry textbook.

Second, background Art

An experiment for measuring the volume fraction of oxygen in air on page 13 of a nine-grade chemical textbook published by Shanghai education publisher in 1 month 2012, wherein the textbook is operated as follows: 1. a gas collecting bottle 5 is divided equally and marked; 2. filling red phosphorus in a combustion spoon with a rubber plug and a conduit, clamping a water stop clamp on a rubber tube, putting the red phosphorus in the combustion spoon on the flame of an alcohol lamp for ignition, rapidly extending into a gas collecting bottle, and plugging the rubber plug tightly; 3. after the gas collecting bottle is cooled to room temperature, the conduit is inserted into a beaker containing water, the water stop clamp is opened, and the phenomenon is observed. The experiment device in the textbook has the following defects: when the burning red phosphorus extends into the gas collecting bottle, the air in the gas collecting bottle is heated to expand, so that part of the air escapes from the gas collecting bottle, and the experimental result has larger deviation; the burning red phosphorus can be emitted into the air to pollute the air before extending into the gas collecting bottle; the red phosphorus burns in the gas collecting bottle to release a large amount of heat, and the rubber plug is possibly flushed, so that the experiment fails.

Third, the contents of the utility model

The utility model aims to provide an environment-friendly experimental apparatus of oxygen volume fraction in survey air uses the utility model discloses the volume fraction of oxygen is safe in the survey air, the environmental protection is pollution-free.

The purpose of the utility model is realized by the following method:

the environment-friendly experimental device for measuring the volume fraction of oxygen in air is mainly characterized in that: the device consists of an alcohol lamp (1), a test tube (3) with a groove at the bottom and filled with copper powder (2), an iron stand (4), a balloon (5), a single-hole rubber plug (6), an air duct (7), a spring clamp (8), a latex tube (9) and an injector (10).

The support test tube (3) which is filled with copper powder (2) and provided with a groove at the bottom is fixed on an iron support (4), and the tube opening of the support test tube (3) is slightly inclined downwards. The balloon (5) is connected to a branch tube with a branch tube (3). The single-hole rubber plug (6) with the air duct (7) tightly plugs the opening of the test tube (3). The latex tube (9) with the spring clamp (8) is connected with the air duct (7) at the outer end of the single-hole rubber plug (6) and the injector (10). The alcohol lamp (1) is arranged right below the groove of the test tube (3).

The experimental process comprises the following steps: firing a groove at the bottom of the test tube (3) with an alcohol blast burner at a high temperature, and placing a proper amount of copper powder (2) in the groove of the test tube (3). Fixing the test tube (3) with copper powder (2) on an iron stand (4) to enable the tube opening of the test tube (3) to slightly incline downwards. The balloon (5) is connected to the branch tube with the branch test tube (3) and is communicated with the branch test tube (3). The air duct (7) is inserted on the single-hole rubber plug (6), and the mouth of the test tube (3) is tightly plugged by the single-hole rubber plug (6) with the air duct (7). The piston of the injector (10) is pulled to the position with 5 scales, and then a latex tube (9) with a spring clamp (8) is connected with the air duct (7) at the outer end of the single-hole rubber plug (6) and the injector (10). The alcohol lamp (1) is placed under the groove of the test tube (3). During the experiment, the spring clamp (8) is clamped, the alcohol lamp (1) is ignited, the copper powder (2) in the test tube (3) is heated by using the outer flame of the alcohol lamp (1), the copper powder (2) continuously reacts with oxygen in the air in the test tube (3) under the heating condition, at the moment, the copper powder (2) is gradually changed into black, and the balloon (5) is slightly enlarged due to the fact that the gas in the test tube (3) is heated. Stopping heating after a period of time, opening the spring clamp (8) when the test tube (3) is cooled to room temperature and the balloon becomes slightly smaller, and seeing that the piston of the injector (10) moves leftwards by 1 scale, namely the piston stays at 4 scales; the size of the balloon (5) is restored. This is because the copper powder (2) consumes about one fifth of the volume of oxygen in the test tube (3) under heating, resulting in a reduced pressure in the test tube (3) and the piston moving to the left by 1 mark under atmospheric pressure. The above phenomenon demonstrates that oxygen in air is one fifth volume per month.

The utility model has the advantages that: the copper powder (2) is placed in the groove with the test tube (3) and is not easy to move when being heated; safe, environment-friendly and pollution-free; the balloon (5) plays a role in adjusting air pressure, and the single-hole rubber plug (6) cannot be punched out; the gas in the test tube (3) can not be leaked, and the experimental result is more accurate.

Description of the drawings

Fig. 1 is a structural view of the present invention.

The symbols in the figures represent:

(1) alcohol lamp (2), copper powder (3) with groove at bottom, support tube (4), iron stand table (5), balloon (6), single-hole rubber plug (7), air duct (8), spring clamp (9), latex tube (10) injector

Fifth, detailed description of the invention

The present invention will be further described with reference to the following detailed description:

The utility model discloses a use method: firing a groove at the bottom of the test tube (3) with an alcohol blast burner at a high temperature, and placing a proper amount of copper powder (2) in the groove of the test tube (3). Fixing the test tube (3) with copper powder (2) on an iron stand (4) to enable the tube opening of the test tube (3) to slightly incline downwards. The balloon (5) is connected to the branch tube with the branch test tube (3) and is communicated with the branch test tube (3). The air duct (7) is inserted on the single-hole rubber plug (6), and the mouth of the test tube (3) is tightly plugged by the single-hole rubber plug (6) with the air duct (7). The piston of the injector (10) is pulled to the position with 5 scales, and then a latex tube (9) with a spring clamp (8) is connected with the air duct (7) at the outer end of the single-hole rubber plug (6) and the injector (10). The alcohol lamp (1) is placed under the groove of the test tube (3). During the experiment, the spring clamp (8) is clamped, the alcohol lamp (1) is ignited, the copper powder (2) in the test tube (3) is heated by using the outer flame of the alcohol lamp (1), the copper powder (2) continuously reacts with oxygen in the air in the test tube (3) under the heating condition, at the moment, the copper powder (2) is gradually changed into black, and the balloon (5) is slightly enlarged due to the fact that the gas in the test tube (3) is heated. Stopping heating after a period of time, opening the spring clamp (8) when the test tube (3) is cooled to room temperature and the balloon becomes slightly smaller, and seeing that the piston of the injector (10) moves leftwards by 1 scale, namely the piston stays at 4 scales; the size of the balloon (5) is restored. This is because the copper powder (2) consumes about one fifth of the volume of oxygen in the test tube (3) under heating, resulting in a reduced pressure in the test tube (3) and the piston moving to the left by 1 mark under atmospheric pressure. The above phenomenon demonstrates that oxygen in air is one fifth volume per month. The utility model has the advantages that: the copper powder (2) is placed in the groove with the test tube (3) and is not easy to move when being heated; safe, environment-friendly and pollution-free; the balloon (5) plays a role in adjusting air pressure, and the single-hole rubber plug (6) cannot be punched out; the gas in the test tube (3) can not be leaked, and the experimental result is more accurate.

Claims

1. The environment-friendly experimental device for measuring the volume fraction of oxygen in air is characterized in that: it consists of an alcohol lamp (1), a support test tube (3) which is provided with copper powder (2) and is provided with a groove at the bottom, an iron stand (4), a balloon (5), a single-hole rubber plug (6), an air duct (7), a spring clamp (8), a latex tube (9) and an injector (10), the notched utensil of bottom of being equipped with copper powder (2) is supported test tube (3) and is fixed on iron stand platform (4), the mouth of pipe of the notched utensil of bottom test tube (3) slightly downward sloping, balloon (5) are connected on the branch pipe of utensil test tube (3), haplopore rubber stopper (6) of taking air duct (7) are plugged in tight bottom notched utensil and are supported test tube (3) mouth of pipe, air duct (7) and syringe (10) of haplopore rubber stopper (6) outer end are connected in latex tube (9) of taking spring clamp (8), alcohol burner (1) are placed under the notched utensil test tube (3) recess of bottom.