CN103865517A - Preparation method of viola tricolor L indicator - Google Patents
Preparation method of viola tricolor L indicator Download PDFInfo
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- CN103865517A CN103865517A CN201410127542.5A CN201410127542A CN103865517A CN 103865517 A CN103865517 A CN 103865517A CN 201410127542 A CN201410127542 A CN 201410127542A CN 103865517 A CN103865517 A CN 103865517A
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- indicator
- wild pansy
- preparation
- viola tricolor
- wild
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Abstract
The invention discloses a preparation method of a viola tricolor L indicator. The preparation method comprises the following steps of collecting viola tricolor L petals, cutting the petals into small pieces with scissors, putting the small pieces into a mortar to be finely ground to release the juice as far as possible, and adding ethanol to dissolve the juice to form viola tricolor L leachate; carrying out rotary evaporation on the roughly prepared leachate; accurately determining the color change interval of the indicator by using a PH sensor and an acid-base titration method. The viola tricolor L acid-base indicator prepared by the method can turn red in case of acid and turn green in case of base, and has the advantages of obviousness in color change and stability.
Description
Technical field
The invention belongs to chemical test equipment technical field, relate to a kind of acid base indicator, relate in particular to a kind of preparation method of wild pansy indicator.
Background technology
In chemical experiment, classmates usually complain that reindeer moss is obvious not to the variable color degree of acid-base solution, find that the blue pigment in reindeer moss is very similar with anthocyanidin, and anthocyanidin are a kind of natural good acid base indicators through inspection.
Wild pansy, is again the titles such as cat face, Herba Iridis japonicae, people's face flower, cat face flower, formal name used at school: Viola tricolor L is a year or short-term per nnial herb of Violales Violaceae Viola.Be common wild flower species, also often cultivate in park.This flower can be seen in park, community and the roadside in Shanghai.The common every flower of wild pansy has purple, red, Huang Sanse, therefore named wild pansy.These species are more cold-resistant, and happiness is nice and cool, blooms and is subject to illumination effect larger.Three look Viola are advisable with outdoor plantation, no matter flower bed, flower garden, potted plant all applicable, but be not suitable for indoor plantation.Wild pansy also can sterilization, comedo, acne, allergic problem on treatment skin.
Contriver finds to contain in purple wild pansy a large amount of anthocyanidin, but anthocyanidin is also the same with reindeer moss obvious not to the variable color of basic solution.Therefore, can utilize wild pansy to develop new acid base indicator.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method of wild pansy indicator, to obtain the obvious wild pansy acid base indicator of variable color, overcomes the deficiency that prior art exists.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A preparation method for wild pansy indicator, is characterized in that, comprises following steps:
Gather wild pansy petal, be cut into strip with scissors and insert in mortar, carefully grind, its juice is discharged as far as possible, add its juice of dissolve with ethanol to form wild pansy leach liquor;
Rough leach liquor is rotated to distillation;
Use the method for PH sensor and acid base titration, accurately determine the color change interval of indicator.
Described wild pansy petal includes purple wild pansy, scarlet wild pansy, yellow wild pansy, and mass ratio is 7:2:1.
Adopt technique scheme, through inspection, it is green that the wild pansy acid base indicator making can be realized sour red alkali, has advantages of that variable color is obvious, stable.
Embodiment
The preparation method of wild pansy indicator of the present invention, comprises the steps:
1, rough indicator
Raw material: 7 of purple wild pansys, 2 of scarlet wild pansys, 1 of yellow wild pansy, ethanol 100mL.
Step: gather wild pansy petal, be cut into strip with scissors and insert in mortar, carefully grind, its juice is discharged as far as possible, add its juice of dissolve with ethanol to form wild pansy leach liquor.
2, carry out qualitative titration
The wild pansy leach liquor of extraction is added drop-wise to respectively in hydrochloric acid and sodium hydroxide solution, observes colour-change.
3, refining indicator:
Rough leach liquor is rotated to distillation, obtains the indicator that comparison precision is higher.
4, the color change interval of determining refining indicator is measured
Use the method for PH sensor and acid base titration, accurately determine the color change interval medicine of indicator: 0.1mol/L acetic acid, 0.1mol/L ammoniacal liquor, refining wild pansy acid base indicator.
5, prepare qualitative test paper
By wild pansy acid base indicator, it makes PH test paper., for qualitative detection, operation and preservation are all very convenient for the red blue dichromatism litmus paper function of this test paper tool.
The wild pansy acid base indicator tool of producing has the following advantages:
1, simple to operate, successful.
The result of wild pansy acid base indicator and litmus reagent contrast.
In variable color situation, we clearly can find out that the variable color of reindeer moss in neutral and alkalescence is difficult to differentiation, too barely satisfactory, wild pansy indicator be change quite obvious, completely can be for the detection of quantitative and qualitative analysis;
2, cost is cheaper, produces safe ready
Below wild pansy indicator and other indicator contrast form:
Compare, wild pansy acid base indicator is even better in raw material, cost and safety.
3, metachromatism is obvious, and color change interval is determined, is applicable to conventional quantitative judgement and acid base titration; And the wild pansy acid base indicator test paper variable color making is obvious, use and preserve all very conveniently, be applicable to carrying and using.
But, those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and be not used as limitation of the invention, as long as within the scope of connotation of the present invention, variation, modification to the above embodiment all will drop within the scope of claims of the present invention.
Claims (2)
1. a preparation method for wild pansy indicator, is characterized in that, comprises following steps:
Gather wild pansy petal, be cut into strip with scissors and insert in mortar, carefully grind, its juice is discharged as far as possible, add its juice of dissolve with ethanol to form wild pansy leach liquor;
Rough leach liquor is rotated to distillation;
Use the method for PH sensor and acid base titration, accurately determine the color change interval of indicator.
2. the preparation method of wild pansy indicator according to claim 1, is characterized in that: described wild pansy petal includes purple wild pansy, scarlet wild pansy, yellow wild pansy, and mass ratio is 7:2:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127542.5A CN103865517A (en) | 2014-03-31 | 2014-03-31 | Preparation method of viola tricolor L indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127542.5A CN103865517A (en) | 2014-03-31 | 2014-03-31 | Preparation method of viola tricolor L indicator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103865517A true CN103865517A (en) | 2014-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410127542.5A Pending CN103865517A (en) | 2014-03-31 | 2014-03-31 | Preparation method of viola tricolor L indicator |
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| CN (1) | CN103865517A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458740A (en) * | 2014-11-24 | 2015-03-25 | 苏州东辰林达检测技术有限公司 | Preparation method for carrot pigment acid-base detection indicator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4445624A1 (en) * | 1994-12-21 | 1996-06-27 | Christian Stadler | Indicator paper |
| CN101672798A (en) * | 2008-09-12 | 2010-03-17 | 上海市长宁区少年科技指导站 | Plant pigment acid-base indicator, preparation method thereof and application thereof |
| CN103411969A (en) * | 2013-08-22 | 2013-11-27 | 上海市闵行第二中学 | Preparation method of pH indicator |
-
2014
- 2014-03-31 CN CN201410127542.5A patent/CN103865517A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4445624A1 (en) * | 1994-12-21 | 1996-06-27 | Christian Stadler | Indicator paper |
| CN101672798A (en) * | 2008-09-12 | 2010-03-17 | 上海市长宁区少年科技指导站 | Plant pigment acid-base indicator, preparation method thereof and application thereof |
| CN103411969A (en) * | 2013-08-22 | 2013-11-27 | 上海市闵行第二中学 | Preparation method of pH indicator |
Non-Patent Citations (1)
| Title |
|---|
| 罗先平等: "化学教学中研究性学习的探索：自制植物酸碱指示剂及其变色范围的测试", 《高等函授学报（自然科学版）》, vol. 17, no. 4, 31 August 2004 (2004-08-31), pages 35 - 39 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458740A (en) * | 2014-11-24 | 2015-03-25 | 苏州东辰林达检测技术有限公司 | Preparation method for carrot pigment acid-base detection indicator |
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Application publication date: 20140618 |