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Acid-base indicator with acid-base color change range indicating function and preparation method

A technology of acid-base indicator and color-changing range, which is applied in the direction of material analysis, chemical instruments and methods, and bulk chemical production through observation of the influence on chemical indicators, and can solve the problem of limiting indication efficiency and acid-base indicator indication range Narrow and other problems, to achieve the effect of enhanced indication function, wide indication range and narrow mutation range

Pending Publication Date: 2021-09-07
张鸿远
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing acid-base indicators have a narrow indication range, and some can only indicate acidity or alkalinity, which limits the indication efficiency

Method used

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  • Acid-base indicator with acid-base color change range indicating function and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An acid-base indicator with the function of indicating the range of acid-base discoloration in this embodiment comprises the following raw materials in parts by weight:

[0028] 20 parts of purple leaf plum leaf extract, 50 parts of organic solvent, 5 parts of ionic liquid;

[0029] The preparation method of the purple leaf plum leaf extract is:

[0030] Step 1: Put the leaves of the purple leaf plum into the ionized liquid for ionization treatment, after the ionization is completed, wash with water;

[0031] Step 2: Then send it into the abrasive for grinding treatment, the grinding speed is 1000-2000r / min, then wash and dry;

[0032] Step 3: Put the dried leaves of Prunus chinensis into water for cooking treatment. The cooking temperature is 100° C. and the cooking time is 20 minutes. After the cooking is completed, filter and combine the filtrates to obtain the extractant of Prunus chinensis leaves.

[0033] The ionized liquid in this embodiment is made of lanthanu...

Embodiment 2

[0040] An acid-base indicator with the function of indicating the range of acid-base discoloration in this embodiment comprises the following raw materials in parts by weight:

[0041] 40 parts of purple leaf plum leaf extract, 100 parts of organic solvent, 15 parts of ionic liquid;

[0042] The preparation method of the purple leaf plum leaf extract is:

[0043] Step 1: Put the leaves of the purple leaf plum into the ionized liquid for ionization treatment, after the ionization is completed, wash with water;

[0044] Step 2: Then send it into the abrasive for grinding treatment, the grinding speed is 2000r / min, then wash with water and dry;

[0045] Step 3: Put the dried leaves of Prunus chinensis into water for cooking treatment, the cooking temperature is 110° C., and the cooking time is 30 minutes. After the cooking is completed, filter and combine the filtrates to obtain the extractant of Prunus chinensis leaves.

[0046] The ionized liquid in this embodiment is made of...

Embodiment 3

[0053] An acid-base indicator with the function of indicating the range of acid-base discoloration in this embodiment comprises the following raw materials in parts by weight:

[0054] 30 parts of purple leaf plum leaf extract, 75 parts of organic solvent, 10 parts of ionic liquid;

[0055] The preparation method of the purple leaf plum leaf extract is:

[0056] Step 1: Put the leaves of the purple leaf plum into the ionized liquid for ionization treatment, after the ionization is completed, wash with water;

[0057] Step 2: Then send it into the abrasive for grinding treatment, the grinding speed is 1500r / min, then wash with water and dry;

[0058] Step 3: Put the dried leaves of Prunus chinensis into water for cooking treatment, the cooking temperature is 105° C., and the cooking time is 25 minutes. After the cooking is completed, filter and combine the filtrates to obtain the extractant of Prunus chinensis leaves.

[0059] The ionized liquid in this embodiment is made of ...

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Abstract

The invention discloses an acid-base indicator with an acid-base color change range indicating function. The acid-base indicator comprises the following raw materials in parts by weight: 20-40 parts of a purple-leaf plum leaf extracting agent, 50-100 parts of an organic solvent and 5-15 parts of ionic liquid. According to the principle that the plant pigment reacts with acid and alkali to generate different colors, the acid-base indicator has the advantages of wide indication range, multiple mutation intervals, narrow mutation range and sensitivity in pH change indication, the natural plant pigment is extracted through the purple-leaf plum leaf extracting agent, and meanwhile, the added ionic liquid can assist in matching of raw materials, so that the indicating function of the indicator is enhanced.

Description

technical field [0001] The invention relates to the technical field of acid-base indicators, in particular to an acid-base indicator with the function of indicating the range of acid-base discoloration and a preparation method thereof. Background technique [0002] Acid-base indicators are a class of compounds that change color as the pH of the solution changes within a specific pH range, usually organic weak acids or organic weak bases. Commonly used acid-base indicators include litmus, phenolphthalein, methyl orange, methyl red, etc., but because this type of acid-base indicator has some shortcomings, for example: the range of litmus color change is between pH5.0-8.0, The color change range of phenolphthalein is 8.2-10.0, which is insufficient for the indication of acidic and strong alkali solutions; the color change range of methyl orange is 3.1-4.4, and the color change range of methyl red is 4.8-6.0. [0003] The existing acid-base indicators have a narrow indication r...

Claims

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Application Information

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IPC IPC(8): G01N21/80C09B61/00C09B67/54C09B67/10
CPCG01N21/80C09B61/00C09B67/0096C09B67/0014Y02P20/54
Inventor 张鸿远
Owner 张鸿远
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