CN211555284U

CN211555284U - Miniature electrolytic device for classroom demonstration

Info

Publication number: CN211555284U
Application number: CN202020261934.1U
Authority: CN
Inventors: 孟晓; 孟迎晨
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-09-22
Anticipated expiration: 2030-03-05

Abstract

The utility model belongs to education and teaching trade, concretely relates to classroom demonstration type electrolytic device. The electrode box comprises an electrode box body, an electrode and an earphone plug; the electrolysis box comprises an electrolysis box body, a battery, a switch and an earphone jack, wherein the inner part of the electrolysis box body is separated into two spaces by a partition plate, the battery and the switch are arranged in one space, the earphone jack is arranged on the partition plate, the battery, the switch and the earphone jack are connected through a wire, the electrode box is placed in the other space, an earphone plug is inserted into the earphone jack, a platform is arranged on the wall in the other space, and a tail gas absorption device is placed on the platform. The utility model discloses the device is simple, and is small, and the reagent quantity is few, and the toxic gas in the use is absorbed in can't the diffusion to the air, does benefit to mr and student's healthy, convenient operation, and experimental phenomenon is obvious, can satisfy all electrolysis experiments basically.

Description

Miniature electrolytic device for classroom demonstration

Technical Field

The utility model belongs to education and teaching trade, concretely relates to classroom demonstration type electrolytic device.

Background

In education, the operation of the electrolysis experiment is performed by using a common experimental instrument, for example, the electrolysis saturated saline solution experiment is performed in a U-shaped tube, and the experiment has the following defects: (1) Pollution is caused: examination of Cl₂At the end of the experiment, Cl in the apparatus₂Is easy to escape and is harmful to human body and environment. (2) Easy suck-back: cl₂When tail gas is absorbed, a conduit is directly inserted into a sodium hydroxide solution, so that reverse absorption is easily caused, and the experiment cannot be further carried out. (3) The resistance is large: the reaction is carried out in a U-shaped tube, so that ions are too long in migration distance between two electrodes, the circuit resistance is large, and the phenomenon cannot be obviously seen in a short time. (4) The device has large volume and large reagent dosage: the student power supply used in the experimental device has large volume and is inconvenient to carry during classroom demonstration; and the experiment is a constant experiment, the dosage of the reagent is more, and more medicines are wasted during the experiment. In education and teaching, most electrolysis experiments have the problems.

In order to solve the defects of the electrolysis experiment in the education and teaching, a set of miniature electrolysis device which is simple in device, convenient to operate, capable of detecting products, free of pollution and high in success rate needs to be designed urgently.

Disclosure of Invention

The utility model aims at providing a classroom demonstration type electrolytic device, the device is simple, and is small, and the reagent quantity is few, and the toxic gas in the use is absorbed in can't spreading to the air, does benefit to mr and student's healthy, convenient operation, and experimental phenomenon is obvious, can satisfy all electrolysis experiments basically.

The classroom demonstration type electrolysis device comprises an electrode box and an electrolysis box, wherein the electrode box comprises an electrode box body, electrodes and an earphone plug, the two electrodes are inserted into the wall of the electrode box body, one end of each electrode is positioned inside the electrode box body, the other end of each electrode is positioned outside the electrode box body, and one end of each electrode positioned outside the electrode box body is respectively connected with the earphone plug; the electrolysis box comprises an electrolysis box body, a battery, a switch and an earphone jack, wherein the inner part of the electrolysis box body is separated into two spaces by a partition plate, the battery and the switch are arranged in one space, the earphone jack is arranged on the partition plate, the battery, the switch and the earphone jack are connected through a wire, the electrode box is placed in the other space, an earphone plug is inserted into the earphone jack, a platform is arranged on the wall in the other space, and a tail gas absorption device is placed on the platform.

The two electrodes are two graphite electrodes or a copper electrode and a graphite electrode respectively; different electrodes can be selected for testing according to different electrolysis experiments.

The electrode box body and the electrolysis box body are preferably both fresh-keeping boxes, the fresh-keeping boxes are convenient and easy to obtain, the cost is low, the materials are transparent, and the observation is easy.

The partition board is made of plastic.

An electrolytic box cover is arranged above the electrolytic box body, and is made of transparent plastic and easy to observe.

As an optimal technical scheme, classroom demonstration type electrolytic device for the saturated salt solution of electrolysis, two electrodes are positive pole and negative pole respectively, place the filter paper that has the saturated salt solution of dripping on two electrodes, the position that corresponds two electrodes on filter paper is dropwise add a drop phenolphthalein respectively, set up a support above the positive pole, set up the aperture at the top of support, place moist starch potassium iodide test paper on the support, the test paper covers the aperture, place the sodium hydroxide solution of dropwise add phenolphthalein in the tail gas absorbing device.

The support is in the shape of a box body with an opening at the bottom, and the support aims to ensure that chlorine gas can be concentrated as much as possible and can escape from small holes in the support, so that more obvious phenomena can be observed.

Preferably, 2-4 small holes are provided at the top of the stent.

The experimental process comprises the following steps: the two electrodes are two graphite electrodes, sodium hydroxide solution is added into the tail gas absorption device, phenolphthalein is dripped on the two electrodes, filter paper dripped with saturated salt water is placed on the two electrodes, then a drop of phenolphthalein is dripped on the filter paper corresponding to the two electrodes respectively, a support is arranged above the anode, a small hole is arranged at the top of the support, moist starch potassium iodide test paper is placed on the support, the test paper covers the small hole, an electrolytic box cover is covered, a switch is opened, and an experiment starts. After about a decade, a gradual red-turning of the filter paper in the cathode region was observed. The wet potassium iodide starch paper in the anode region turned blue. The tail gas absorption device is used for absorbing chlorine, so that the generated chlorine cannot leak all the time, and the physical health of teachers and students cannot be harmed. After a significant phenomenon was observed, the switch was closed.

The experimental phenomena can guide students to analyze products possibly generated by the two electrodes respectively, and fully understand and master the working principle of the electrolytic cell.

The class demonstration type electrolysis device can be used for electrolyzing Na when two electrodes are two graphite electrodes₂SO₄And (4) solution experiment.

The classroom demonstration type electrolysis unit can be used for electroplating experiments when one of the two electrodes is a graphite electrode and the other one is a copper electrode.

Compared with the prior art, the utility model has the advantages of it is following:

(1) the utility model discloses a miniaturization of experiment. Change student's power into the battery, reduced the volume of experimental articles for use greatly, more be favorable to the teacher to carry on the class, and the battery can be changed, is equipped with the switch in the device, can begin to end the experiment at any time, convenient to use, only need during the experiment change soak the filter paper of salt solution can, easy and simple to handle clearly. Meanwhile, the existing U-shaped tube experiment is changed into a filter paper experiment, the reagent dosage is less, and the concept and consciousness of saving the cost of students are cultivated from a slight place.

(2) The utility model discloses an environmental protection of experiment changes. During the experiment, the electrolytic box can be covered, and the experimental device can form a closed system, so that the experiment is in a closed state, and toxic gas cannot diffuse into the air; and the tail gas absorption device is arranged in the electrolytic box, so that toxic gas can be absorbed by the device, and the health of teachers and students cannot be harmed. This is beneficial to the development of students to form the concept and consciousness of environmental protection.

(3) The classroom demonstration type electrolysis device has obvious experimental phenomenon. The experiment is a trace experiment, but the detection of the products of the two poles, namely chlorine and sodium hydroxide is still very obvious. The switch can be turned on within one minute to see an obvious phenomenon, so that the teaching demonstration device is very suitable for teachers to demonstrate in class and is also suitable for students to observe in a grouping experiment. A holder was placed in the anode region for moist test paper of starch potassium iodide. The purpose of the support is to allow chlorine to escape from the pores of the support as intensively as possible, which is beneficial for observing more obvious phenomena.

(4) The classroom demonstration type electrolysis device has universality. By adopting the design of the single electrode box, different electrodes can be selected for testing according to different electrolysis experiments, so that the electrolysis box becomes diversified. The electrode box can be replaced at will by the electrolysis box, and the experimental device not only can be used for electrolyzing saturated saline solution, but also can electrolyze sodium sulfate solution, copper chloride solution and the like. The electrode box is replaced, and the device can also be used for electroplating experiments and the like. One device can satisfy substantially all electrolysis experiments.

Drawings

Fig. 1 is a schematic structural diagram of an electrode cartridge according to the present invention;

FIG. 2 is a schematic structural view of an electrolytic cartridge according to the present invention;

fig. 3 is a schematic structural view of the bracket and the small hole of the utility model;

FIG. 4 is a schematic structural view of a classroom demonstration type electrolyzer according to the present invention;

FIG. 5 is a schematic structural view of the classroom demonstration type electrolysis device of the present invention when used for electrolyzing saturated saline solution;

FIG. 6 is a photograph showing the class demonstration type electrolytic device of the present invention;

FIG. 7 is a photograph of a classroom demonstration type electrolyzer of the present invention used in an experiment for electrolyzing saturated saline solution;

FIG. 8 is a photograph of a saturated saline solution in a classroom demonstration type electrolyzer of the present invention;

FIG. 9 is a classroom demonstration type electrolyzer for electrolyzing Na₂SO₄The left picture is before the experiment, and the right picture is after the experiment;

FIG. 10 is a photograph showing the electrolytic apparatus of the class demonstration type according to the present invention in the electroplating experiment; the left graph is before the experiment, and the right graph is after the experiment;

in the figure: 1-electrode box body, 2-electrode, 3-earphone plug, 4-battery, 5-clapboard, 6-electrolysis box body, 7-platform, 8-switch, 9-earphone jack, 10-filter paper, 11-bracket, 12-test paper, 13-small hole, and 14-tail gas absorption device.

Detailed Description

The present invention will be further described with reference to the following examples.

Example 1

A classroom demonstration type electrolytic device is shown in figures 1, 2 and 4 and comprises an electrode box and an electrolytic box, wherein the electrode box comprises an electrode box body 1, electrodes 2 and an earphone plug 3, the two electrodes 2 are inserted into the wall of the electrode box body 1, one ends of the two electrodes 2 are positioned inside the electrode box body 1, the other ends of the two electrodes are positioned outside the electrode box body 1, and one ends of the two electrodes positioned outside the electrode box body 1 are respectively connected with the earphone plug 3; the electrolysis box includes electrolysis box body 6, battery 4, switch 8 and earphone jack 9, separate into two spaces with 6 internal divisions of electrolysis box body with baffle 5, the inside battery 4 that is equipped with in one of them space, switch 8, set up earphone jack 9 on the baffle 5, all connect through the wire between battery 4, switch 8 and the earphone jack 9, the inside electrode box that places in another space, inside earphone plug 3 inserted earphone jack 9, set up a platform 7 on the inside wall in another space, place tail gas absorbing device 14 on the platform 7. FIG. 6 is a photograph of an electrolytic apparatus of class demonstration type.

The two electrodes 2 are two graphite electrodes.

The electrode box body 1 and the electrolysis box body 6 both adopt preservation boxes.

The partition 5 is made of plastic.

An electrolytic box cover is arranged above the electrolytic box body 6.

The classroom demonstration type electrolysis device is used for the experiment of electrolyzing saturated salt water. As shown in fig. 5, the two electrodes 2 are an anode and a cathode, a piece of filter paper 10 dropped with saturated saline solution is placed on the two electrodes 2, a drop of phenolphthalein is dropped on the filter paper 10 at a position corresponding to the two electrodes, a bracket 11 is disposed above the anode, three small holes 13 are disposed at the top of the bracket 11, a wet starch potassium iodide test paper 12 is placed on the bracket 11, the test paper 12 covers the small holes 13, and a sodium hydroxide solution dropped with phenolphthalein is placed in the tail gas absorption device 14.

As shown in fig. 3, the support 11 is in the form of an open-bottomed box, the purpose of which is to allow the chlorine to escape as intensively as possible from the small holes in the support, which is advantageous for the observation of more pronounced phenomena.

The experimental process comprises the following steps:

the two electrodes 2 are two graphite electrodes, sodium hydroxide solution is added into the tail gas absorption device 14, phenolphthalein is dripped on the two electrodes 2, filter paper 10 dripped with saturated salt water is placed on the two electrodes 2, then a drop of phenolphthalein is dripped on the filter paper 10 corresponding to the two electrodes respectively, a support 11 is arranged above the anode, a small hole 13 is arranged at the top of the support 11, moist starch potassium iodide test paper 12 is placed on the support 11, the test paper 12 covers the small hole 13, an electrolytic box cover is covered, a switch is opened, and the experiment is started. After about a decade or so, it can be observed that the filter paper 10 in the cathode region gradually turns red. The wet starch potassium iodide paper 12 in the anode region turned blue. The tail gas absorption device 14 is used for absorbing chlorine gas, so that the generated chlorine gas cannot leak all the time and the physical health of teachers and students cannot be harmed. FIG. 7 is a photograph of an example of an electrolyzer for demonstration in class before use in an experiment for electrolyzing saturated saline solution; FIG. 8 is a photograph of a saturated saline solution in a classroom demonstration type electrolyzer after the electrolyzer is used for an experiment for electrolyzing saturated saline solution. After a significant phenomenon is observed, the switch 8 is closed.

Example 2

A classroom demonstration type electrolyzer, the structure of which is the same as that of example 1.

The device is used for electrolyzing Na₂SO₄Solution experiment, experimental procedure: as shown in the left diagram of FIG. 9, Na drops are placed on the two electrodes 2₂SO₄The pH test paper of the solution is covered on an electrolytic box cover, a switch 8 is opened, the experiment starts, and after about ten seconds, as shown in the right graph of fig. 9, the pH test paper in the cathode area gradually turns red, and the pH test paper in the anode area turns blue.

The embodiment has short time and obvious phenomenon, is suitable for classroom demonstration and is beneficial to students to understand the electrolysis process according to the phenomenon.

Example 3

A classroom demonstration type electrolysis device has the same structure as the embodiment 1, and the only difference is that: one of the two electrodes 2 is a graphite electrode and the other is a copper electrode.

The device is used for electroplating experiments, and the experimental process comprises the following steps: as shown in the left diagram of FIG. 10, the copper electrode is connected with the positive electrode of the power supply, the graphite electrode is connected with the negative electrode of the power supply, and CuSO is dropped on the two electrodes 2₄The filter paper of the solution is covered with the electrolytic box cover, the switch 8 is opened, and the experiment is started. After about thirty seconds, the filter paper was removed, and as shown in the right diagram of FIG. 10, it was observed that red substances were precipitated on the graphite electrode edges in the cathode region.

The embodiment has short time for phenomenon occurrence and obvious phenomenon, is suitable for classroom demonstration, and is beneficial to students to understand the electroplating process according to the phenomenon. This embodiment has the further advantage that after the reaction has ended, both electrodes can be connected in opposition to the power supply electrode, so that the copper on the graphite electrode can be returned to the copper electrode again by electrolysis, with essentially zero loss of the electrodes.

Claims

1. The class demonstration type electrolytic device is characterized in that: the electrode box comprises an electrode box body (1), electrodes (2) and an earphone plug (3), wherein the two electrodes (2) are inserted into the wall of the electrode box body (1), one ends of the two electrodes (2) are positioned inside the electrode box body (1), the other ends of the two electrodes are positioned outside the electrode box body (1), and one ends of the two electrodes positioned outside the electrode box body (1) are respectively connected with the earphone plug (3); the electrolysis box comprises an electrolysis box body (6), a battery (4), a switch (8) and an earphone jack (9), two spaces are separated into by a partition plate (5) from the inside of the electrolysis box body (6), the battery (4) and the switch (8) are arranged in one space, the earphone jack (9) is arranged on the partition plate (5), the battery (4), the switch (8) and the earphone jack (9) are connected through a wire, an electrode box is arranged in the other space, an earphone plug (3) is inserted into the earphone jack (9), a platform (7) is arranged on the wall in the other space, and a tail gas absorption device (14) is arranged on the platform (7).

2. The classroom demonstration electrolysis device according to claim 1, wherein: the two electrodes (2) are two graphite electrodes or a copper electrode and a graphite electrode respectively.

3. The classroom demonstration electrolysis device according to claim 1, wherein: the electrode box body (1) and the electrolysis box body (6) both adopt preservation boxes.

4. The classroom demonstration electrolysis device according to claim 1, wherein: the partition board (5) is made of plastic.

5. The classroom demonstration electrolysis device according to claim 1, wherein: an electrolytic box cover is arranged above the electrolytic box body (6).

6. A classroom demonstration electrolysis device according to any one of claims 1 to 5 wherein: two electrodes (2) are positive pole and negative pole respectively, place filter paper (10) that drop has saturated salt solution on two electrodes (2), a drop phenolphthalein is dripped respectively to the position that corresponds two electrodes on filter paper (10), set up a support (11) above the positive pole, top at support (11) sets up aperture (13), place moist starch potassium iodide test paper (12) at the top of support (11), test paper (12) cover aperture (13), place the sodium hydroxide solution of dropwise add phenolphthalein in tail gas absorbing device (14).

7. The classroom demonstration electrolysis device according to claim 6, wherein: the bracket (11) is in the shape of a box body with an opening at the bottom.

8. The classroom demonstration electrolysis device according to claim 6, wherein: 2-4 small holes (13) are arranged at the top of the bracket (11).