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Method for identifying sodium bicarbonate and sodium carbonate solutions by using phenolphthalein-alcohol solution

A technology of alcohol solution and sodium bicarbonate, which is applied in the fields of chemistry, chemical industry and medicine, can solve the problems of calcium ion turbidity and even precipitation, and the inability to distinguish sodium carbonate and sodium bicarbonate solution, etc., achieving individuality, high success rate, and reproducible good sex effect

Inactive Publication Date: 2017-02-01
HUNAN UNIV OF SCI & TECH
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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 1mol / L sodium bicarbonate solution and 0.01mol / L sodium carbonate solution respectively. Add 1 drop of 0.05% phenolphthalein-50% ethanol solution to the sodium bicarbonate solution, the color of the solution does not change after shaking; drop 1 drop of phenolphthalein-alcohol solution into the sodium carbonate solution, the solution turns red after shaking.

Embodiment 2

[0016] Take two small test tubes and add 2 mL of 0.8mol / L sodium bicarbonate solution and 0.05mol / L sodium carbonate solution respectively. Add 1 drop of 0.05% phenolphthalein-50% ethanol solution to the sodium bicarbonate solution, the color of the solution does not change after shaking; drop 1 drop of phenolphthalein-alcohol solution into the sodium carbonate solution, the solution turns red after shaking.

Embodiment 3

[0018] Take two small test tubes and add 2 mL of 0.5mol / L sodium bicarbonate solution and 0.1mol / L sodium carbonate solution respectively. Add 1 drop of 0.05% phenolphthalein-50% ethanol solution to the sodium bicarbonate solution, the color of the solution does not change after shaking; drop 1 drop of phenolphthalein-alcohol solution into the sodium carbonate solution, the solution turns red after shaking.

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PUM

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Abstract

The invention discloses a method for identifying sodium bicarbonate and sodium carbonate solutions by using a phenolphthalein-alcohol solution. The method is implemented by respectively dropwisely adding the phenolphthalein-alcohol solution with a specific concentration into the sodium bicarbonate and sodium carbonate solutions. The result shows that the sodium bicarbonate solution is still colorless without color changes, but the sodium carbonate solution can turn the phenolphthalein red. The method effectively solves the problem of quick identification on the colorless transparent sodium bicarbonate and sodium carbonate solutions, can better provide services for production, living, scientific research and teaching, and has the advantages of simple equipment, great operation convenience, accessible reagents, obvious phenomenon and favorable effects.

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 bicarbonate and sodium carbonate solution with a phenolphthalein-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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 李大塘龙云飞孙冉李伶辉
Owner HUNAN UNIV OF SCI & TECH
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