Teaching material demonstration experiment device for sulfur dioxide property and experiment method thereof

Abstract

The invention discloses a teaching material demonstration experiment device for sulfur dioxide properties. The teaching material demonstration experiment device comprises an iron frame, a hard glass tube, a rubber plug, a rubber tube, a balloon, an injector and a drawer type small tube. The invention further provides a teaching material demonstration experiment method for sulfur dioxide properties. The teaching material demonstration experiment method comprises the steps of preparing experiment instruments, preparing experiment reagents, making preparations, connecting devices, starting an experiment, observing experiment phenomena and drawing a conclusion. The device has the advantages that the device is small in size, and reagents are saved; connection is less, air tightness is good, and pollution is reduced; 2, the combined device can be freely disassembled, so that the reagent can be conveniently taken and placed, and the instrument can be conveniently washed; operation is convenient, the phenomenon is obvious, and consumed time is short; 4, the device can be used for demonstration experiments and grouping experiments; 5, the device can be popularized to an experiment integrating preparation of all toxic gases and a plurality of property inspection experiments; and 6, the device is suitable for experiments of the barium chloride solution with sulfur dioxide and ammonia gas or strong oxidizing gas such as chlorine gas at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of teaching experiments, and particularly to a teaching demonstration experiment device for the properties of sulfur dioxide and an experimental method thereof. Background Art

[0002] In the compulsory chemistry textbook for senior high school of the People's Education Edition, the experiment for testing the properties of sulfur dioxide only explores the bleaching property and the property of acidic oxide of sulfur dioxide, and does not design experiments for the reducing property and oxidizing property of sulfur dioxide. If we want to demonstrate the reducing property and oxidizing property of sulfur dioxide, we need to add devices, which may cause problems such as poor airtightness, cumbersome connection of devices, and waste of time. The latest simple devices on the market are not conducive to liquid filling and cleaning. In view of this, the teaching demonstration experiment device for the properties of sulfur dioxide is specifically improved. Summary of the Invention

[0003] To solve the above existing problems, the present invention provides a teaching demonstration experiment device for the properties of sulfur dioxide and an experimental method thereof, which transforms and assembles traditional experimental instruments into a device that can complete multiple experiments simultaneously. This device not only reduces the connection of instruments and the use of reagents, but also saves experimental time. The present invention is realized through the following technical solutions.

[0004] A teaching demonstration experiment device for the properties of sulfur dioxide includes an iron stand, a hard glass tube, rubber stoppers, rubber tubes, balloons, syringes, and drawer-type small tubes.

[0005] The iron stand is composed of a base, and columns and brackets symmetrically arranged on both sides of the upper end surface of the base. The hard glass tube is horizontally mounted on the brackets on both sides.

[0006] The rubber stoppers are respectively plugged at both ends of the hard glass tube. One end of the rubber tube is inserted into one of the rubber stoppers and is in communication with the inside of the hard glass tube. The balloon is sleeved and tied at the other end of the rubber tube. The needle of the syringe is inserted into the other rubber stopper and is in communication with the inside of the hard glass tube.

[0007] The drawer-type small tube is horizontally placed inside the hard glass tube.

[0008] Further, the bracket is a U-shaped bracket.

[0009] Further, the drawer-type small tube includes a simulated dropping plate groove in the middle and reaction vessels symmetrically arranged at both ends of the simulated dropping plate groove. The diameter of the simulated dropping plate groove is 15 mm, and the length of the reaction vessels at both ends is 35 mm.

[0010] A teaching demonstration experiment method for the properties of sulfur dioxide includes the following steps:

[0011] Step One

[0012] Prepare the experimental instruments: hard glass tube, drawer-type small tube, syringe, balloon, iron stand;

[0013] Step 2

[0014] Prepare the experimental reagents: concentrated sulfuric acid, sodium sulfite, purple litmus solution, magenta solution, acidic potassium permanganate solution, sodium sulfide solution, barium chloride solution, soda lime, a little tremella, and a red date;

[0015] Step 3

[0016] Do the preparatory work: Put a little soda lime in the balloon in advance to absorb the excess sulfur dioxide and prevent the pressure in the hard glass tube from being too high;

[0017] After connecting the device, check the airtightness. Then put 2 g of sodium sulfite powder in the reaction container at the end of the drawer-type small tube close to the syringe. Drop 4 drops of purple litmus solution, 4 drops of acidic potassium permanganate solution, 4 drops of barium chloride solution, and 4 drops of sodium sulfide solution into the middle of the drawer-type small tube to simulate the drip plate groove. Finally, put a little tremella and a red date on the two drip plates respectively. Drop 2 ml of magenta solution into the reaction container at the other end of the drawer-type small tube. Carefully put the drawer-type small tube into the hard glass tube, adjust the position, and plug the rubber stopper on the hard glass tube;

[0018] Step 4

[0019] Start the experiment: Inhale concentrated sulfuric acid with the syringe, insert the needle, and push the syringe to inject about 2 ml of 70% concentrated sulfuric acid into contact with sodium sulfite in the drawer-type small tube;

[0020] Step 5

[0021] Observe the experimental phenomena and draw conclusions.

[0022] Advantages of the present invention:

[0023] 1. The device has a small volume, saving reagents; few connections, good airtightness, reducing pollution;

[0024] 2. The combined device can be disassembled freely, facilitating the taking and placing of reagents and the washing of instruments;

[0025] 3. Easy to operate, obvious phenomena, and short time-consuming;

[0026] 4. It can be used for demonstration experiments and group experiments;

[0027] 5. It can be extended to the experiments of preparing all toxic gases and multiple property tests in one;

[0028] 6. This device is suitable for the experiments of barium chloride solution reacting with sulfur dioxide and ammonia or strong oxidizing gases such as chlorine at the same time. Brief Description of the Drawings

[0029] Figure 1 This is a structural diagram of a teaching demonstration experiment device for the properties of sulfur dioxide according to the present invention. Detailed Embodiments

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0032] In addition, if terms such as "horizontal", "vertical", "hanging" are used, it does not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the embodiments of the present invention, "a plurality of" represents at least two.

[0034] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly defined and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The scientific method and scientific principle of the present invention:

[0036] The scientific method is the experimental method;

[0037] The scientific principles are the oxidizing property, reducing property, bleaching property of sulfur dioxide and the properties of acidic oxides.

[0038] Examples:

[0039] A teaching demonstration experiment device for the properties of sulfur dioxide, including an iron stand 10, a hard glass tube 20, rubber stoppers 30, a rubber tube 40, a balloon 50, a syringe 60 and a drawer-type small tube 70;

[0040] The iron stand 10 is composed of a base 11, columns 12 symmetrically arranged on both sides of the upper end face of the base 11, and a U-shaped bracket 13. The hard glass tube 20 is horizontally mounted on the two side brackets 13;

[0041] The rubber stoppers 30 are respectively inserted into the two ends of the hard glass tube 20. One end of the rubber tube 40 is inserted into one of the rubber stoppers 30 and communicated with the inside of the hard glass tube 20. The balloon 50 is sleeved and tied at the other end of the rubber tube 40. The needle of the syringe 60 is inserted into the other rubber stopper 30 and communicated with the inside of the hard glass tube 20;

[0042] The drawer-type small tube 70 is horizontally placed inside the hard glass tube 20. The drawer-type small tube 70 includes a simulated dropping plate groove 71 in the middle and reaction vessels 72 symmetrically arranged at both ends of the simulated dropping plate groove 71. The diameter of the simulated dropping plate groove 71 is 15 mm, and the length of the two end reaction vessels 72 is 35 mm;

[0043] Among them, the reaction vessel 72 serves as a gas generation device, and the middle simulated dropping plate groove 71 is used to test the properties of the gas. The hard glass tube 20 forms a closed system to prevent air pollution.

[0044] A teaching demonstration experiment method for the properties of sulfur dioxide, including the following steps:

[0045] Step 1

[0046] Prepare the experimental instruments: hard glass tube, drawer-type small tube, syringe, balloon, iron stand;

[0047] Step 2

[0048] Prepare the experimental reagents: concentrated sulfuric acid, sodium sulfite, purple litmus solution, magenta solution, acidic potassium permanganate solution, sodium sulfide solution, barium chloride solution, soda lime, a little tremella, and a red date;

[0049] Step 3

[0050] Do the preparatory work: Put a little soda lime in the balloon in advance to absorb the excess sulfur dioxide and at the same time prevent the pressure in the hard glass tube from being too high;

[0051] Check the airtightness after the connection device is assembled. Then, place 2 g of sodium sulfite powder in the reaction vessel at the end of the drawer-type small tube near the syringe. Drop 4 drops of purple litmus solution, 4 drops of acidic potassium permanganate solution, 4 drops of barium chloride solution, and 4 drops of sodium sulfide solution into the middle of the drawer-type small tube to simulate the groove of the spotting plate. Finally, place a little tremella and red dates on the two spotting plates respectively, and drop 2 ml of fuchsin solution into the reaction vessel at the other end of the drawer-type small tube. Carefully place the drawer-type small tube into the hard glass tube, adjust the position, and plug the rubber stopper on the hard glass tube;

[0052] Step Four

[0053] Start the experiment: Draw concentrated sulfuric acid into the syringe, insert the needle, and push the syringe to inject about 2 ml of 70% concentrated sulfuric acid into contact with sodium sulfite in the drawer-type small tube;

[0054] Step Five

[0055] Observe the experimental phenomena and draw conclusions: The purple litmus solution turns red, indicating that sulfur dioxide reacts with water to form an acid, verifying the property of sulfur dioxide as an acidic oxide. The purple litmus does not fade, indicating that sulfur dioxide does not bleach acid-base indicators. The fading of the acidic potassium permanganate solution proves the reducibility of sulfur dioxide, and the purple permanganate ion is reduced to a colorless substance by sulfur dioxide. The formation of a yellow precipitate in the sodium sulfide solution is because sulfur dioxide and sulfide ions undergo a disproportionation reaction, and sulfur dioxide acts as an oxidizing agent. There is no phenomenon in the barium chloride solution, indicating that sulfur dioxide cannot form a precipitate with barium chloride solution. From the fading of the fuchsin solution, it can be seen that sulfur dioxide has bleaching properties. When heated at the bottom, it is found that the red color returns, indicating that the bleaching principle of sulfur dioxide is different from that of chlorine water. The bleaching property of chlorine water is due to its strong oxidizing property, while the bleaching of sulfur dioxide is a combined-type bleaching and its bleaching is reversible. The last two spotting plates allow students to visually observe the changes in red dates and tremella after being fumigated with sulfur dioxide, enabling students to apply what they have learned and select safe foods for themselves and their families in life. This device can also add barium chloride solution to the spotting plate of the drawer-type small tube, and the reaction vessels at both ends of the drawer-type small tube can be used as the generating devices for sulfur dioxide and ammonia or chlorine, etc., which is conducive to students' further understanding of the properties of sulfur dioxide.

[0056] The above describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention, design similar structural manners and embodiments without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A teaching demonstration experimental device for the properties of sulfur dioxide, characterized in that: It includes an iron stand, a hard glass tube, rubber stoppers, rubber tubes, balloons, syringes, and drawer-type small tubes; The iron stand is composed of a base, and struts and brackets symmetrically arranged on both sides of the upper end surface of the base. The hard glass tube is horizontally mounted on the brackets on both sides; The rubber stoppers are respectively inserted at both ends of the hard glass tube. One end of the rubber tube is inserted into one of the rubber stoppers and communicates with the inside of the hard glass tube. The balloon is sleeved and tied at the other end of the rubber tube. The needle of the syringe penetrates into the other rubber stopper and communicates with the inside of the hard glass tube; The drawer-type small tube is horizontally placed inside the hard glass tube.

2. The teaching demonstration experimental device for the properties of sulfur dioxide according to claim 1, characterized in that: The bracket is a U-shaped bracket.

3. The teaching demonstration experiment device for the properties of sulfur dioxide according to claim 1, characterized in that: The drawer-type small tube includes a simulated drip plate groove in the middle and reaction vessels symmetrically arranged at both ends of the simulated drip plate groove. The diameter of the simulated drip plate groove is 15 mm, and the length of the reaction vessels at both ends is 35 mm.

4. A teaching demonstration experiment method for the properties of sulfur dioxide, characterized in that, It includes the following steps: Step 1 Prepare the experimental instruments: hard glass tube, drawer-type small tube, syringe, balloon, iron stand; Step 2 Prepare the experimental reagents: concentrated sulfuric acid, sodium sulfite, purple litmus solution, fuchsin solution, acidic potassium permanganate solution, sodium sulfide solution, barium chloride solution, soda lime, a little tremella, and a red date; Step 3 Do the preparatory work: Put a little soda lime in the balloon in advance to absorb the excess sulfur dioxide and prevent the pressure in the hard glass tube from being too high at the same time; After connecting the device, check the airtightness of the device. Then put 2 g of sodium sulfite powder in the reaction vessel at the end of the drawer-type small tube close to the syringe. Drop 4 drops of purple litmus solution, 4 drops of acidic potassium permanganate solution, 4 drops of barium chloride solution, and 4 drops of sodium sulfide solution into the middle simulated drip plate groove of the drawer-type small tube respectively. Finally, put a small amount of tremella and a red date on the two drip plates respectively. Drop 2 ml of fuchsin solution into the reaction vessel at the other end of the drawer-type small tube. Carefully put the drawer-type small tube into the hard glass tube, adjust the position, and plug the rubber stopper on the hard glass tube; Step 4 Start the experiment: Draw concentrated sulfuric acid into the syringe, insert the needle, and push the syringe to inject about 2 ml of 70% concentrated sulfuric acid into contact with sodium sulfite in the drawer-type small tube; Step 5 Observe the experimental phenomena and draw conclusions.

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