CN111243409A - Demonstration component of color-changing reagent and color-changing demonstration method - Google Patents
Demonstration component of color-changing reagent and color-changing demonstration method Download PDFInfo
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- CN111243409A CN111243409A CN202010174679.1A CN202010174679A CN111243409A CN 111243409 A CN111243409 A CN 111243409A CN 202010174679 A CN202010174679 A CN 202010174679A CN 111243409 A CN111243409 A CN 111243409A
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Abstract
The invention discloses a demonstration component of a color-changing reagent and a color-changing demonstration method, comprising a group of color-changing reagents, qualitative filter paper, a reagent bottle and a matched painting brush; wherein, the color-changing reagent is formed by mixing a main color-changing agent A and an additive B; wherein the main color-changing reagent comprises five color-changing reagents, namely AgNO3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2(ii) one of S solutions; and the color-changeable reagent can be sequentially coated on the qualitative filter paper according to a set chemical reaction sequence; the additive B is polyvinyl alcohol solution. The demonstration component can intuitively display obvious color change on qualitative filter paper (generally white qualitative filter paper), does not sag and can immediately develop color and change color in the brushing process, and arouses curiosity and learning desire of students in the teaching process. The method can also be combined with the existing teaching means such as projection and the like.
Description
Technical Field
The invention relates to the field of teaching demonstration, in particular to a demonstration component of a color-changing reagent and a color-changing demonstration method.
Background
At present, on the premise of quality teaching, in order to arouse the interest of students in chemical reaction knowledge, guide the students to think, further mobilize the enthusiasm of the students, which is always a task and a target of teaching, a new demonstration means and a new demonstration method are explored and invented. The conventional method generally selects a transparent test tube or a transparent container, and improves the attention or the enthusiasm of students by changing color once or twice. However, since the test tube demonstration is a cognition under a normal learning situation, curiosity of students cannot be fully excited, and the test tube demonstration increases consumption of reagents, needs to be operated in a fixed environment and is not convenient to carry; moreover, conventional tube color development is not easily combined with modern teaching aids such as projection, and cannot be adapted to modern teaching means.
Disclosure of Invention
The invention aims to organically combine painting activities with chemical reaction discoloration phenomena, overcome the defects that the traditional experiment reagent is large in consumption, the operating environment is fixed, and the traditional experiment reagent cannot be adapted to advanced teaching aids such as projection and the like, provide a color-changeable reagent demonstration component and a color-changing demonstration method, and provide a mobile and ubiquitous learning mode. The demonstration component can intuitively display obvious color change on the filter paper (generally white filter paper), does not sag and can immediately develop and change color in the brushing process, the color change provided by the invention is different from the color change of the conventional pigment superposition based on the three primary colors principle, and the experiment can show colorless and colorless coating color change, colored and colorless coating color change and the like, so that the curiosity and the learning desire of students can be fully triggered in the teaching process. Moreover, the invention can paint or draw pictures on the filter paper, has large color rendering area and is more visual, and can be combined with the existing teaching means such as projection and the like. Moreover, the chemical reagent used by the invention is small, compared with the conventional test tube color development demonstration, the reagent is saved, and the invention has the advantages of convenient carrying, random operation environment and the like.
In order to achieve the purpose, the invention provides a color-changeable reagent demonstration assembly, which comprises a group of color-changeable reagents, qualitative filter paper and a reagent bottle matched row pen; wherein, the color-changing reagent is formed by mixing a main color-changing agent A and an additive B; wherein the main toner A comprisesFive color-changing reagents which are respectively AgNO3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2(ii) one of S solutions; the color-changeable reagent can be sequentially coated on the qualitative filter paper according to a set chemical reaction sequence; the additive B is polyethylene solution.
The invention also provides a method for demonstrating color change by applying the demonstration component, wherein the method comprises the step of firstly demonstrating AgNO containing3The solution color-changing reagent is coated on qualitative filter paper, and then coated with K2CrO4The color-changing reagent of the solution, brick red appears at the overlapped position of the two color-changing reagents, and then the brick red is coated on the brick red position by the color-changing reagent containing the KSCN solution, so that the brick red is changed into white; then coating a white part with a variable color reagent containing KI solution, wherein the white part is changed into yellow; further using Na2The S solution coats the yellow spot which turns to black.
Through the technical scheme, the color-changeable reagent can be coated on the qualitative filter paper according to a set chemical reaction sequence, color is developed on the filter paper under the set chemical reaction, and color change occurs along with the superposition of the reagent. In the above technical scheme, the predetermined chemical reaction may be 2Ag++CrO4 2-＝Ag2CrO4↓ (brick red), Ag2CrO4+CN-AgSCN ↓ (white); AgSCN + I-AgI ↓ (yellow); AgI + S2-＝Ag2S ↓ (black), namely containing AgNO first3The solution color-changing reagent is coated on qualitative filter paper, and then coated with K2CrO4The color-changing reagent of the solution, brick red appears at the overlapped position of the two color-changing reagents, and then the brick red is coated on the brick red position by the color-changing reagent containing the KSCN solution, so that the brick red is changed into white; then coating a white part with a variable color reagent containing KI solution, wherein the white part is changed into yellow; further using Na2The S solution coats the yellow spot which turns to black. Thus, four color changes can occur on the filter paper with the reagent superimposed. Moreover, the demonstration assembly of the invention can be used for visually displaying on the filter paper (generally white filter paper)The color change provided by the invention is different from the color change of the conventional pigment superposition based on the three primary colors, the phenomenon can generate colorless and colorless coating color change, colored and colorless coating color change and the like, and the painting process and the chemical reaction phenomenon can be organically combined, so that the curiosity and the learning desire of students can be aroused in the teaching process. Moreover, the invention can paint or draw pictures on the filter paper, has large color rendering area and is more visual, and can be combined with the existing teaching means such as projection and the like. Moreover, the chemical reagent used in the invention is small, compared with the conventional test tube color development demonstration, the reagent is saved, the portable test tube color development demonstration instrument is easy to carry, and the movable and ubiquitous learning effect is realized.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a side view of a demonstration assembly of a color changing agent.
In fig. 1:1 is qualitative filter paper; and 2 is a supporting layer.
Fig. 2 is a schematic structural diagram of a reagent bottle matched row pen.
In fig. 2: 3 is a reagent bottle; 4 is a bottle cap; 5 is a spread pen.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a demonstration assembly of a color-changing reagent, which comprises a group of color-changing reagents, qualitative filter paper, a reagent bottle and a small row of pens, wherein the small row of pens are matched with the color-changing reagents; wherein, the color-changing reagent is formed by mixing a main color-changing agent A and an additive B; wherein, the group of color-changing reagents comprises five color-changing reagents, and the main color-changing reagent A is AgNO3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2(ii) one of S solutions; the color-changeable reagent can be sequentially coated on the qualitative filter paper according to a set chemical reaction sequence; the additive B is polyvinyl alcohol solution. Thus, in use, the color-changeable reagent is applied to the qualitative filter paper in accordance with a predetermined chemical reaction sequence, and the color is developed on the filter paper in accordance with the predetermined chemical reaction sequence, and the color is changed in accordance with the addition of the reagent. In the above technical scheme, the predetermined chemical reaction may be 2Ag++CrO4 2-＝Ag2CrO4↓ (brick red), Ag2CrO4+CN-AgSCN ↓ (white); AgSCN + I-AgI ↓ (yellow); AgI + S2-＝Ag2S ↓ (black), namely containing AgNO first3The solution color-changing reagent is coated on qualitative filter paper, and then coated with K2CrO4The color-changing reagent of the solution, brick red appears at the overlapped position of the two color-changing reagents, and then the brick red is coated on the brick red position by the color-changing reagent containing the KSCN solution, so that the brick red is changed into white; then coating a white part with a variable color reagent containing KI solution, wherein the white part is changed into yellow; further using Na2The S solution coats the yellow spot which turns to black. Thus, four color changes can occur on the filter paper with the reagent superimposed. Moreover, the demonstration assembly can intuitively display obvious color change on the filter paper (generally white filter paper), does not sag and can immediately develop color and change color in the brushing process, the color change provided by the invention is different from the color change of the conventional pigment superposition based on the principle of three primary colors, and the demonstration assembly has a colorless coating space and a colorless coating spaceThe color change of the coating is characterized by the color change between colored coating and colorless coating, and the like, so that the curiosity and the knowledge seeking of students can be aroused in the teaching process. Moreover, the invention can paint or draw pictures on the filter paper, has large color rendering area and is more visual, and can be combined with the existing teaching means such as projection and the like. Moreover, the chemical reagent used in the invention is small, compared with the conventional test tube color development demonstration, the reagent is saved, the carrying is convenient, the operation is convenient, and the movable and ubiquitous learning effects can be realized.
In a preferred embodiment of the invention, the concentration of the main toner A is 0.08-0.12 mol/L; the volume ratio of the main toner A to the additive B is 1: 0.8-1.2; the additive B contains 1-2% of polyvinyl alcohol (with the polymerization degree of 1700-1800) solution by mass fraction. Therefore, each reaction is more visual, and in the demonstration process, the color change is fast and more obvious without sagging.
In a preferred embodiment of the present invention, as shown in fig. 1, the qualitative filter paper further includes a support layer 2 disposed below the qualitative filter paper 1. Preferably, the backing layer is corrugated paper.
In a preferred embodiment of the present invention, the qualitative filter paper is a medium speed qualitative filter paper. Preferably, the qualitative filter paper is a thickened qualitative filter paper on the market, so that more main toners can be adsorbed, and the subsequent reaction discoloring is rapid and obvious.
In a preferred embodiment of the present invention, the back surface of the qualitative filter paper is attached to the support layer by coating the periphery of the back surface of the qualitative filter paper with a solid glue.
In a preferred embodiment of the present invention, there is further included the step of storing the reagent in a brown or dark reagent bottle with a seamless mating cap prior to applying the color changing reagent.
In a preferred embodiment of the invention, the cap 4 can be screwed onto the reagent bottle 3 by inserting the row pen 5 into the cap 4, as shown in fig. 2.
The invention also provides a method for demonstrating color change by applying the demonstration component, wherein the method comprises the step of firstly demonstrating AgNO containing3Coating color-changing reagent of the solution on qualitative filter paper, and then coatingCoated with K2CrO4The color-changing reagent of the solution, brick red appears at the overlapped position of the two color-changing reagents, and then the brick red is coated on the brick red position by the color-changing reagent containing the KSCN solution, so that the brick red is changed into white; then coating a white part with a variable color reagent containing KI solution, wherein the white part is changed into yellow; further using Na2The S solution coats the yellow spot which turns to black.
The method of the invention has the advantages of more color development and color change, quick and obvious color change, and the painting on the filter paper is just like the conventional painting, but the color change is different from the conventional three-primary-color pigment color development, so that the process is more surprising, and the curiosity and the learning desire of students can be improved.
The color changes in turn as follows: brick red → white → yellow → black, optionally skip the application of reagent along the brick red → black direction, skip the application of color, but not reverse the application of color, such as changing brick red to yellow, without KSCN coating in the order of brick red to yellow, brick red to black, yellow to black, but not black to yellow, or yellow to brick red, etc.
In a preferred embodiment of the present invention, the method further comprises the step of attaching a support layer to the back surface of the qualitative filter paper before applying the color-changing reagent.
The present invention will be described in detail below by way of examples.
Preparation example 1
Preparation of a reagent:
preparing a main toner A: AgNO with the concentration of 0.08mol/L is prepared respectively3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2And (5) preparing an S solution.
Preparing an additive B: a polyvinyl alcohol (degree of polymerization 1799) solution containing 1% by mass of polyvinyl alcohol was prepared.
Prepared AgNO3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2And mixing the S solution with the additive B according to the volume ratio of 1:1.2 respectively to obtain a group of color-changing reagents.
Preparation example 2
Preparation of a reagent:
preparing a main toner A: respectively preparing AgNO with the concentration of 0.10mol/L3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2And (5) preparing an S solution.
Preparing an additive B: a polyvinyl alcohol (degree of polymerization 1799) solution containing 1.5% by mass was prepared.
Prepared AgNO3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2And mixing the solution S with the additive B according to the volume ratio of 1:1 respectively to obtain a group of color-changing reagents.
Preparation example 3
Preparation of a reagent:
preparing a main toner A: respectively preparing AgNO with the concentration of 0.12mol/L3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2And (5) preparing an S solution.
Preparing an additive B: a polyvinyl alcohol (degree of polymerization 1799) solution containing 2% by mass was prepared.
Prepared AgNO3Solutions, KSCN solutions, K2CrO4Solution, KI solution and Na2And mixing the S solution with the additive B according to the volume ratio of 1:0.8 respectively to obtain a group of color-changing reagents.
Example 1
The drawing paper is ordinary medium-speed qualitative filter paper, one side of the filter paper is coated with solid glue, the other side of the filter paper is a picture, and the side coated with the solid glue is adhered to corrugated paper with the same size and flattened.
A set of color-changing reagents prepared in preparation example 1 are taken, and AgNO is firstly contained3The solution color-changing reagent is coated on qualitative filter paper, and then coated with K2CrO4The color-changing reagent of the solution, brick red appears at the overlapped position of the two color-changing reagents, and then the brick red is coated on the brick red position by the color-changing reagent containing the KSCN solution, so that the brick red is changed into white; then coating a white part with a variable color reagent containing KI solution, wherein the white part is changed into yellow; further using Na2The S solution is coated on yellow parts, and the yellow parts are changed into black parts。
The precipitation conversion reaction is as follows:
2Ag++CrO4 2-＝Ag2CrO4↓ (brick red)
Ag2CrO4+SCN-AgSCN ↓ (white)
AgSCN+I-Together with AgI ↓ (yellow)
AgI+S2-＝Ag2S ↓ (Black)
The color changes in turn as follows: brick red → white → yellow → black, or skip reagent application along the brick red → black direction, skip color change, but not reverse application color change, such as brick red to yellow, or no KSCN application in the order of brick red to yellow, but not black to yellow, or yellow to brick red, etc.
Example 2
A set of color-changing reagents of preparation example 2 was brushed on filter paper as in example 1.
Example 3
A set of the color-changing reagents of preparation example 3 was brushed on filter paper as in example 1.
Comparative example 1
The filter paper was coated in the same manner as in example 1 except that the main toner A in the preparation example was used as a color-changing agent, i.e., the additive B was not added.
TABLE 1
| Example numbering | Phenomenon(s) |
| Example 1 | Fast color development, obvious color change and no sagging |
| Example 2 | Fast color development, obvious color change and no sagging |
| Example 3 | Fast color development, obvious color change and no sagging |
| Comparative example 1 | Slow, uneven and sagging color development |
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A demonstration component of a color-changing reagent is characterized by comprising a group of color-changing reagents, qualitative filter paper, reagent bottles and matched row pens;
wherein, the color-changing reagent is formed by mixing a main color-changing agent A and an additive B; wherein the main color changing agent A is a group of five color changing agents which are AgNO3Solution, K2CrO4Solution, KSCN solution, KI solution and Na2(ii) one of S solutions;
and the color-changeable reagent can be sequentially coated on the qualitative filter paper according to a set chemical reaction sequence;
the additive B is polyvinyl alcohol solution.
2. The demonstration assembly according to claim 1, wherein the concentration of the primary colorant a is 0.08-0.12 mol/L.
3. The demonstration assembly according to claim 2, wherein each of the variable color agents in the primary colorant a is mixed with the additive B in a volume ratio of 1: 0.8-1.2.
4. The demonstration assembly according to claim 3, wherein the additive B comprises a polyvinyl alcohol solution with a mass fraction of 1% -2%; the polymerization degree of the polyvinyl alcohol is 1700-1800.
5. The demonstration assembly according to claim 4, further comprising a backing layer disposed below the qualitative filter paper; wherein, the backing layer is corrugated paper.
And/or the qualitative filter paper is medium-speed qualitative filter paper.
6. The demonstration assembly according to any of claims 1 to 5, wherein the row of pens is inserted in the middle of the cap of the bottle, and the row of pens and the cap of the bottle are seamlessly joined.
7. The demonstration assembly of claim 6, wherein the reagent bottle is a twist-top brown glass bottle or a dark plastic bottle.
8. A method of demonstrating color change using the demonstration assembly of any one of claims 1 to 7, comprising first including AgNO3The solution color-changing reagent is coated on qualitative filter paper, and then coated with K2CrO4The color-changing reagent of the solution, brick red appears at the overlapped position of the two color-changing reagents, and then the brick red is coated on the brick red position by the color-changing reagent containing the KSCN solution, so that the brick red is changed into white; coating the white part with a color-changing reagent containing KI solution, and changing the white partIs yellow; further using Na2The S solution coats the yellow spot which turns to black.
9. The method of claim 8, further comprising the step of attaching a backing layer to the back side of the qualitative filter paper before applying the color-changing reagent.
10. The method of claim 9, wherein the back side of the qualitative filter paper is attached to the susceptor by coating the back side of the qualitative filter paper with a solid glue.
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