Demonstration device for reaction of copper and nitric acid

Abstract

The utility model discloses a demonstration device for reaction of copper and nitric acid, which is characterized by comprising a transparent cylinder body with an opening at one end and a piston matched in the transparent cylinder body, and one end of the piston facing the opening is connected with a piston rod; the other end of the transparent cylinder is connected with a liquid inlet pipe, and an openable sealing mechanism is arranged on the liquid inlet pipe; a detachable positioning piece is arranged in the transparent cylinder body, a positioning part for fixing copper for reaction is arranged on the positioning piece, and the positioning part is close to the cylinder wall on one side of the transparent cylinder body in the radial direction; the positioning piece is located on the side, away from the piston rod, of the piston. The device has the advantages of simple structure, convenience in operation and use, good air tightness and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental equipment, in particular to a demonstration device for the reaction of copper and nitric acid. Background Art

[0002] The reaction experiment of copper and nitric acid is an important demonstration experiment when explaining the oxidizing property of nitric acid. Figure 1 An experimental demonstration device is used to control the occurrence and stop of the reaction by pulling the copper wire. However, during use, it still has the following shortcomings: it is impossible to eliminate the air interference in the device, which affects the intuitive observation of nitric oxide gas; the air tightness of the device is easily reduced after pulling the copper wire multiple times. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a copper and nitric acid reaction demonstration device with simple structure, easy operation and good air tightness.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A demonstration device for the reaction of copper and nitric acid is characterized in that it includes a transparent cylinder with an open end and a piston fitted in the transparent cylinder, wherein the piston is connected to a piston rod at the end facing the open end; the other end of the transparent cylinder is connected to a liquid inlet pipe, and the liquid inlet pipe is provided with an openable sealing mechanism; a detachable positioning piece is provided in the transparent cylinder, and the positioning piece has a positioning portion for fixing the reaction copper, and the positioning portion is close to the cylinder wall on one radial side of the transparent cylinder; the positioning piece is located on the side of the piston away from the piston rod.

[0006] Using the above structure, before the experiment, the piston and positioning member are removed from the transparent cylinder. After securing the copper sheet to the positioning member, the positioning member and piston are then sequentially installed into the transparent cylinder. During the experiment, the sealing mechanism is opened, the liquid inlet tube is placed in dilute nitric acid, and the piston is pulled by the piston rod to draw the dilute nitric acid into the transparent cylinder. Due to the positioning member, the piston cannot expel air all at once. Therefore, the transparent cylinder can be turned upward, the air can be squeezed out by the piston, and dilute nitric acid can be pumped in again until all the air is expelled and the dilute nitric acid volume is sufficient. The sealing mechanism is then used to close the liquid inlet tube. The transparent cylinder is placed flat on the work surface, with the copper sheet at the lowest position. The colorless gas (NO) produced by the reaction between copper and dilute nitric acid pushes the piston outward, causing the solution to gradually turn blue. After a period of reaction, the transparent cylinder is rotated to position the copper sheet at the highest position. Since gas is already present in the transparent cylinder, the copper sheet at the highest position separates from the dilute nitric acid, and the reaction ceases. The sealing mechanism is used to open the liquid inlet tube, and the piston is pulled to draw in air. Once air enters, the colorless gas (NO) turns reddish-brown (NO₂). The demonstration device can expel air through a piston, preventing air from affecting the reaction and ensuring more reliable experimental results. A copper sheet is fixed to one side of the cylinder using a positioning piece. Simply flipping the transparent cylinder stops the reaction, and new reactants can be added by pulling the piston out, making operation more convenient.

[0007] Furthermore, the positioning member has a guide surface in contact with the inner wall of the transparent cylinder, the circumscribed circle diameter of the guide surface and the transparent cylinder are annular as a whole, and the positioning portion is a positioning groove provided on the annular wall of the positioning member.

[0008] Furthermore, the positioning groove is located on the outer side wall of the positioning member, and the bottom of the positioning groove has a hollow hole extending therethrough.

[0009] In this way, the copper sheet is placed in the positioning groove and the positioning member is installed in the transparent cylinder. The copper sheet is fixed between the positioning member and the cylinder wall of the transparent cylinder. Since the bottom of the positioning groove has a hollow hole, nitric acid can contact the copper sheet through the hollow hole, thereby achieving a reaction.

[0010] Furthermore, the positioning member is fixedly connected to the piston, and the positioning portion is a slot provided on the positioning member.

[0011] In this way, the piston can be pulled out and the copper sheet or copper wire can be directly inserted into the slot for fixation, which makes the operation more convenient.

[0012] Furthermore, the liquid inlet pipe is integrally formed on the transparent cylinder, and the sealing mechanism is a rubber sleeve sleeved on the liquid inlet pipe.

[0013] Furthermore, the transparent cylinder has two lugs extending radially outward.

[0014] In this way, the transparent cylinder can be placed more stably on the operating table through the support ears to prevent the transparent cylinder from rolling.

[0015] Furthermore, a collar is sleeved on the transparent cylinder, and the lug is arranged on the collar.

[0016] Because the positioning piece needs to be removed to place the copper sheet or copper wire, and after the positioning piece is reinstalled into the transparent cylinder, the relative position of the copper sheet or copper wire in the circumferential direction of the transparent cylinder will change. When the transparent cylinder is placed flat using the support ears, the copper sheet or copper wire cannot be located at the lowest or highest point. In this case, the transparent cylinder and the ring can be rotated relative to each other to adjust the copper sheet or copper wire to the lowest or highest point.

[0017] Furthermore, the open end of the transparent cylinder has a flange protruding in the radial direction.

[0018] In this way, the collar cannot be removed from the flange, and the lug can be used to assist in operating the piston rod, making operation more convenient.

[0019] In summary, the utility model has the advantages of simple structure, easy operation and use, good airtightness, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the existing experimental demonstration device.

[0021] Figure 2 Schematic diagram of the structure of this embodiment.

[0022] Figure 3 for Figure 1 Schematic diagram of the decomposition structure.

[0023] Figure 4 and Figure 5 Schematic diagram of the positioning slot at the lowest and highest points. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the embodiments.

[0025] When implementing: Figures 2 to 5As shown, a demonstration device for the reaction of copper and nitric acid comprises a transparent cylinder 1 with one end open and a piston 2 fitted within the transparent cylinder 1. The piston 2 is connected to a piston rod 3 on the open end. The other end of the transparent cylinder 1 is connected to a liquid inlet pipe 4, which is provided with an openable sealing mechanism 5. A detachable positioning member 6 is provided within the transparent cylinder 1. The positioning member 6 has a positioning portion for fixing the reaction copper, and the positioning portion is close to the cylinder wall on one radial side of the transparent cylinder 1. The positioning member 6 is located on the side of the piston 2 facing away from the piston rod 3. In this embodiment, the liquid inlet pipe 4 is integrally formed on the transparent cylinder 1, and the sealing mechanism 5 is a rubber sleeve that is sleeved over the liquid inlet pipe 4.

[0026] like Figures 3 to 5 As shown, the positioning member 6 has a guide surface that contacts the inner wall of the transparent cylinder 1, and the circumscribed diameter of the guide surface is consistent with the inner diameter of the transparent cylinder 1. Specifically, the positioning member (6) is annular as a whole, and the positioning portion is a positioning groove provided on the annular wall of the positioning member 6. The positioning groove is located on the outer side wall of the positioning member 6, and the bottom of the positioning groove has a hollow hole provided therethrough. After the copper sheet is placed in the positioning groove and the positioning member is installed in the transparent cylinder, the copper sheet is fixed between the positioning member and the cylinder wall of the transparent cylinder. Since the bottom of the positioning groove has a hollow hole, nitric acid can contact the copper sheet through the hollow hole, thereby achieving a reaction.

[0027] In a specific implementation, the positioning member 6 can also be fixedly connected to the piston 2. The positioning portion is a slot provided on the positioning member 6. After the piston is pulled out, the copper sheet or copper wire can be directly inserted into the slot for fixing, which is more convenient. In this case, the piston 2 itself can even be used as the positioning member. Without penetrating the piston 2, a blind hole can be drilled near the edge of the piston 2, and the copper sheet or copper wire can be inserted into the blind hole to fix the reaction copper.

[0028] In this embodiment, the transparent cylinder 1 has two lugs 7 extending radially outward. Figure 3 As shown, the transparent cylinder 1 is provided with a collar 8, and the lug 7 is provided on the collar 8. The open end of the transparent cylinder 1 has a flange 9 formed by radial protrusion. Since the positioning member needs to be taken out to place the copper sheet or copper wire, and after the positioning member is put into the transparent cylinder again, the relative position of the copper sheet or copper wire in the circumferential direction of the transparent cylinder will change. After the transparent cylinder is laid flat using the lug, the copper sheet or copper wire cannot be located at the lowest point or the highest point. At this time, the transparent cylinder and the collar can be rotated relative to each other so that the copper sheet or copper wire is located at the lowest point or the highest point. In addition, the collar cannot fall off from the flange, so the lug can be used to assist in operating the piston rod, making the operation more convenient.

[0029] Using the demonstration device of this embodiment, the reaction experiment of nitric acid and copper can be carried out using the following steps. The experimental steps are as follows:

[0030] 1. Before the experiment, remove the piston and positioning piece from the transparent cylinder, place the copper sheet or copper wire in the positioning groove, and then install the positioning piece and piston into the transparent cylinder in sequence. Push the piston completely into the transparent cylinder. The positioning piece uses the friction with the inner wall of the transparent cylinder to stay at the end of the transparent cylinder close to the liquid inlet pipe.

[0031] 2. During the experiment, remove the rubber sleeve on the liquid inlet tube, place the liquid inlet tube in dilute nitric acid, and use the piston rod to pull the piston to suck the dilute nitric acid into the transparent cylinder; point the liquid inlet tube toward and push the piston to expel the air in the transparent cylinder, and cover it with the rubber sleeve.

[0032] 3. Place the transparent cylinder flat on the operating table and rotate the ring 8 to place the copper sheet or copper wire at the lowest point to ensure that the copper sheet or copper wire is always in the solution. During the reaction, colorless gas is generated and pushes the piston to move outward.

[0033] 4. After a period of reaction, turn the transparent cylinder over so that the copper sheet or copper wire is at the highest position, separate from the solution, and stop the reaction.

[0034] 5. Turn the transparent cylinder upwards (with the liquid inlet tube facing upwards). Since the positioning piece is located at the end of the transparent cylinder close to the liquid inlet tube, the copper sheet will still be separated from the solution and will not produce further reaction. Pull the piston to put the transparent cylinder in a negative pressure state, slowly open the rubber cover to let air enter the transparent cylinder, then cover the rubber cover and observe the color change of the gas in the transparent cylinder.

[0035] 6. Open the rubber cover again and absorb the NaOH solution. Close the rubber cover tightly and shake it thoroughly to observe the color change of the solution.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A demonstration device for the reaction of copper and nitric acid, characterized in that: The invention comprises a transparent cylinder (1) with an open end and a piston (2) fitted in the transparent cylinder (1), wherein the piston (2) is connected to a piston rod (3) at the end facing the open end; the other end of the transparent cylinder (1) is connected to a liquid inlet pipe (4), and the liquid inlet pipe (4) is provided with an openable sealing mechanism (5); a detachable positioning member (6) is provided in the transparent cylinder (1), and the positioning member (6) has a positioning portion for fixing the reaction copper, and the positioning portion is close to the cylinder wall on one radial side of the transparent cylinder (1); the positioning member (6) is located on the side of the piston (2) away from the piston rod (3).

2. The demonstration device for the reaction of copper and nitric acid as claimed in claim 1, wherein: The positioning member (6) has a guide surface in contact with the inner wall of the transparent cylinder (1), and the diameter of the circumscribed circle of the guide surface is consistent with the inner diameter of the transparent cylinder (1).

3. The demonstration device for the reaction of copper and nitric acid as claimed in claim 2, characterized in that: The positioning member (6) is annular as a whole, and the positioning portion is a positioning groove provided on the annular wall of the positioning member (6).

4. The demonstration device for the reaction of copper and nitric acid as claimed in claim 3, wherein: The positioning groove is located on the outer side wall of the positioning member (6), and the bottom of the positioning groove has a hollow hole extending therethrough.

5. The demonstration device for the reaction of copper and nitric acid as claimed in claim 1, wherein: The positioning member (6) is fixedly connected to the piston (2), and the positioning portion is a slot provided on the positioning member (6).

6. The demonstration device for the reaction of copper and nitric acid as claimed in claim 1, wherein: The liquid inlet pipe (4) is integrally formed on the transparent cylinder (1), and the sealing mechanism (5) is a rubber sleeve sleeved on the liquid inlet pipe (4).

7. The demonstration device for the reaction of copper and nitric acid as claimed in claim 1, characterized in that: The transparent cylinder (1) is provided with two lugs (7) extending radially outward.

8. The demonstration device for the reaction of copper and nitric acid as claimed in claim 7, characterized in that: A collar (8) is sleeved on the transparent cylinder (1), and the lug (7) is arranged on the collar (8).

9. The demonstration device for the reaction of copper and nitric acid as claimed in claim 1, wherein: The open end of the transparent cylinder (1) has a flange (9) protruding in the radial direction.

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