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Preparation method of acid and base test paper

A production method and test paper technology, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of insufficient discoloration of alkaline solutions and unsuitability for indoor planting, etc. To achieve a clear effect of discoloration

Inactive Publication Date: 2014-06-18
SHANGHAI MINXING SECOND MIDDLE SCHOOL
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Problems solved by technology

Sancolor is suitable for outdoor planting, whether it is suitable for flower beds, gardens, or potted plants, but it is not suitable for indoor planting
[0004] The inventor found that the purple pansy contains a large amount of anthocyanins, but the anthocyanins, like litmus, are not obvious enough to change the color of the alkaline solution

Method used

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  • Preparation method of acid and base test paper

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Embodiment Construction

[0015] The preparation method of acid-base test paper of the present invention may further comprise the steps:

[0016] 1. Crude indicator

[0017] Raw materials: 7 purple pansies, 2 deep red pansies, 1 yellow pansy, 100mL ethanol.

[0018] Steps: Collect pansy petals, cut them into small pieces with scissors, put them in a mortar, grind them finely to release the juice as much as possible, add ethanol to dissolve the juice to form a pansy extract.

[0019] 2. Perform qualitative titration

[0020] Add the extracted pansy extract dropwise to hydrochloric acid and sodium hydroxide solution respectively, and observe the color change.

[0021] 3. Refined indicator:

[0022] The crude leaching solution is subjected to rotary distillation to obtain an indicator with higher accuracy.

[0023] 4. Determine the color change range of the refined indicator. Use the method of pH sensor and acid-base titration to accurately determine the color change range of the indicator. Drugs: 0.1...

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Abstract

The invention discloses a preparation method of acid and base test paper. 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 [0001] The invention belongs to the technical field of chemical test equipment, and relates to an acid-base indicator, in particular to a method for making an acid-base test paper. Background technique [0002] In chemical experiments, students often complain that the discoloration of litmus to acid-base solution is not obvious enough. After testing, it is found that the blue pigment in litmus is very similar to anthocyanin, and anthocyanin is a natural good acid-base indicator. . [0003] Pansy, also known as cat face, butterfly flower, human face flower, cat face flower, etc., scientific name: Viola tricolor L, is an annual or short-term perennial herbaceous plant of the Viola family Viola family. It is a common wildflower species and is often cultivated in parks. This flower can be seen in parks, communities and roadsides in Shanghai. Pansy usually has three colors of purple, red and yellow in each flower, so it is called pansy. This species is more co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/80
Inventor 胡健杨子涛
Owner SHANGHAI MINXING SECOND MIDDLE SCHOOL
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