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Method for distinguishing sodium carbonate and sodium bicarbonate solution by lead ion

A technology of sodium bicarbonate and sodium carbonate, applied in the fields of medicine, chemistry, and chemical industry, can solve the problems of inability to distinguish sodium carbonate and sodium bicarbonate solution, turbidity and even precipitation of calcium ions, and achieve the characteristics of individuality, obvious phenomenon and reproducibility. Good results

Inactive Publication Date: 2021-02-26
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 by lead ions. The present invention mainly is, get two small test tubes, add sodium carbonate, sodium bicarbonate solution of equal volume respectively; It is white and turbid, and there is no obvious phenomenon in sodium bicarbonate solution; thus, it can be distinguished from colorless sodium carbonate and sodium bicarbonate solution. The method of the invention has strong reliability, good reproducibility and high success rate; obvious phenomena and full of individuality; medicines and materials are easy to obtain; convenient operation and strong safety; and can be applied in technical fields such as chemistry, chemical industry and medicine.

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 Patents(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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