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A kind of thymol blue-alcohol solution distinguishes the method for sodium carbonate and sodium bicarbonate solution

A technology of thymol blue and alcohol solution, applied in the fields of chemistry, chemical industry and medicine, can solve the problems of calcium ion turbidity or even precipitation, inability to distinguish sodium carbonate and sodium bicarbonate solution, etc. easy-to-get effect

Active Publication Date: 2021-10-08
GUANGZHOU COLLEGE OF TECH BUSINESS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, although the dissociated carbonate ions of sodium bicarbonate in aqueous solution are few, they are enough to produce turbidity or even precipitation with calcium ions. Practice has proved that it is impossible to distinguish sodium carbonate and sodium bicarbonate solutions with the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take two small test tubes and add 2 mL of 0.01mol / L sodium carbonate solution and saturated (1.04mol / L) sodium bicarbonate solution respectively. Add 1 drop of 0.0125% thymol blue-20% ethanol solution to the sodium carbonate solution, the solution turns blue after shaking, add a drop of thymol blue-alcohol solution to the sodium bicarbonate solution, the color of the solution remains unchanged after shaking , still colorless.

Embodiment 2

[0016] Take two small test tubes, add 2 mL of 0.05mol / L sodium carbonate solution and 0.8mol / L sodium bicarbonate solution respectively, and then drop 1 drop of 0.0125% thymol blue-20% ethanol solution respectively, shake the sodium carbonate The solution was blue, and the color of the sodium bicarbonate solution did not change and was still colorless.

Embodiment 3

[0018] Take two small test tubes, add 2 mL of 0.1mol / L sodium carbonate solution and 0.5mol / L sodium bicarbonate solution respectively, then drop 1 drop of 0.0125% thymol blue-20% ethanol solution respectively, shake the sodium carbonate solution It is blue, and the color of sodium bicarbonate solution has not changed, and it is still colorless.

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PUM

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Abstract

The invention discloses a method for identifying sodium carbonate and sodium bicarbonate solutions with a thymol blue-alcohol solution. The method of the present invention is to add dropwise thymol blue-alcoholic solution of specific concentration respectively in sodium carbonate and sodium bicarbonate solution. The results showed that sodium carbonate solution could turn thymol blue blue, while sodium bicarbonate solution had no color change. The method of the present invention effectively solves the problem of rapid identification of both colorless and transparent sodium carbonate and sodium bicarbonate solutions, can better provide services for production, life, scientific research and teaching, and has simple equipment, convenient operation, and easy access to drugs. Yes, the phenomenon is obvious and the effect is very good.

Description

technical field [0001] The invention belongs to the technical fields of medicine, chemical industry and chemistry, and in particular relates to a method for discriminating sodium carbonate and sodium bicarbonate solutions with a thymol blue-alcohol solution. [0002] technical background [0003] There are two types of carbonates: normal salt and acid salt. Generally, normal salt is difficult to dissolve in water, while acid salt is easy to dissolve in water. It is used to explain the formation principle of natural landscapes such as caves, stalactites and stalagmites. Affected by this principle explanation, people naturally think of using calcium chloride solution to identify sodium carbonate and sodium bicarbonate solutions. In fact, this method is not feasible, because even if the sodium bicarbonate solution with a very dilute concentration of 0.01mol / L is mixed with a calcium chloride solution of 0.01mol / L, there will be turbidity. See: ①Liu Di, Li Datang. Cannot use CaC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 李大塘成奋民邱喜阳孙冉李伶辉
Owner GUANGZHOU COLLEGE OF TECH BUSINESS CO LTD
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