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Method for identifying NaHCO3 solution and Na2CO3 solution by virtue of chrome method

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

Inactive Publication Date: 2016-12-21
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

[0012] Take two small test tubes and add 1mL of potassium dichromate solution respectively. Add 6 drops of 1mol / L NaHCO to a test tube 3 Solution, see that the orange-red color of potassium dichromate solution has not completely turned into yellow, add 7 drops to completely turn into yellow; add 6 drops of 0.1mol / L Na to another test tube 2 CO 3 solution, see the orange-red color of potassium dichromate completely turning to yellow.

Embodiment 2

[0014] Take two small test tubes and add 1mL potassium dichromate solution respectively. Add 6 drops of 0.8mol / L NaHCO to a test tube 3 solution, see that the orange red of the potassium dichromate solution has not completely turned into yellow; add 4 drops of 0.2mol / L Na to another test tube 2 CO 3 solution, see the orange-red color of potassium dichromate completely turning to yellow.

Embodiment 3

[0016] Take two small test tubes and add 1mL of potassium dichromate solution respectively. Add 6 drops of 0.5mol / L NaHCO to a test tube 3 solution, see that the orange red of the potassium dichromate solution has not completely turned into yellow; add 3 drops of 0.5mol / L Na to another test tube 2 CO 3 solution, see the orange-red color of potassium dichromate quickly and completely turn to yellow.

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PUM

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Abstract

The invention discloses a method for identifying NaHCO3 solution and Na2CO3 soltuion by virtue of a chrome method. The method disclosed by the invention mainly comprises the following steps: taking two small test tubes, and respectively adding 1mL potassium dichromate solution with the concentration of 0.01mol / L; respectively adding less than six drops of NaHCO3 solution and Na2CO3 solution into the two small test tubes, wherein NaHCO3 solution does not enable orange red of the potassium dichromate solution to be converted into yellow or completely converted into yellow, and Na2CO3 solution can enable the orange red of the potassium dichromate solution to be completely converted into yellow; therefore, NaHCO3 solution and colourless Na2CO3 solution which are colourless respectively can be distinguished. The method disclosed by the invention has strong reliability, good reproducibility and high success rate; a phenomenon is obvious, and individuality is rich; medicines and materials are easily available; operation is convenient, and security is strong; and the method disclosed by the invention can be applied to the technical fields of chemistry, chemical engineering and medicines.

Description

technical field [0001] The invention belongs to the technical fields of medicine, chemical industry and chemistry, in particular to a chromium method for identifying constant concentration NaHCO 3 with Na 2 CO 3 solution method. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
CPCG01N21/79
Inventor 李大塘李伶辉
Owner HUNAN UNIV OF SCI & TECH