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Method for identifying sodium carbonate and sodium bicarbonate solution through lead ions

A technology of sodium bicarbonate and sodium carbonate, applied in the fields of chemistry, medicine, and chemical industry, can solve the problems of calcium ion turbidity or even precipitation, and the inability to distinguish sodium carbonate and sodium bicarbonate solution, etc., achieving individuality, high success rate, and convenient operation Effect

Inactive Publication Date: 2017-02-22
GUANGZHOU COLLEGE OF TECH BUSINESS CO LTD
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  • Summary
  • Abstract
  • Description
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  • 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

[0012] Take two small test tubes, add 1mL, 0.01mol / L sodium carbonate to one test tube, add 1mL, saturated (1.04mol / L) sodium bicarbonate solution to the other test tube; Add 8 drops of 0.0005mol / L lead nitrate solution. Sodium carbonate solution appears very obvious white turbidity or even precipitation, and sodium bicarbonate solution has no obvious phenomenon.

Embodiment 2

[0014] Take two small test tubes, add 1mL, 0.05mol / L sodium carbonate to one test tube, add 1mL, 1.mol / L sodium bicarbonate solution to the other test tube; add 5 Drops, 0.0005mol / L lead nitrate solution. A white precipitate appeared in the sodium carbonate solution, but there was no obvious phenomenon in the sodium bicarbonate solution.

Embodiment 3

[0016] Take two small test tubes, add 1mL, 0.1mol / L sodium carbonate solution to one test tube, add 1mL, 0.8mol / L sodium bicarbonate solution to the other test tube; add 3 drops to the two small test tubes respectively , 0.0005mol / L lead nitrate solution. A white precipitate appeared in the sodium carbonate solution, but there was no obvious phenomenon in the sodium bicarbonate solution.

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PUM

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Abstract

The invention discloses a method for identifying sodium carbonate and sodium bicarbonate solution through lead ions. The method mainly comprises the following steps of adopting two small test tubes, and respectively adding the sodium carbonate and the sodium bicarbonate solution in same volume; respectively adding lead nitrate solutions with the concentration being 0.0005mol / L in same volume in the two small test tubes, wherein a sodium carbonate solution appears white opacity, and the sodium bicarbonate solution has no apparent phenomenon, so that the colorless sodium carbonate and the sodium bicarbonate solution can be identified. The method provided by the invention is high in reliability, good in reproducibility, high in success rate, obvious in phenomenon, rich in individuality, easy to obtain medicines and materials, convenient and fast to operate, and high in safety, and can be applied in the technical fields of chemistry, chemical industry, medicine and the like.

Description

technical field [0001] The invention belongs to the technical fields of chemistry, chemical industry and medicine, and in particular relates to a method for identifying sodium carbonate and sodium bicarbonate by lead ions. Background technique [0002] 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 CaCl 2 Identify Na 2 CO 3 and NaHCO 3 Theor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/82
CPCG01N21/82
Inventor 李大塘邓望孙冉李晗
Owner GUANGZHOU COLLEGE OF TECH BUSINESS CO LTD
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