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Method for distinguishing NaHCO3 and Na2CO3 solution by iodine water

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

Inactive Publication Date: 2017-05-10
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

[0013] Take two small test tubes, add 0.5mL iodine water and 1 drop of starch solution respectively. Add 6 drops of saturated (1.04mol / L) NaHCO to a test tube 3 Solution, see that the blue color of iodine water and starch has not completely subsided, add 10 drops to completely subside; add 6 drops of 0.01mol / L Na to another test tube 2 CO 3 Solution, see the blue color of iodine water and starch completely recede.

Embodiment 2

[0015] Take two small test tubes, add 0.5mL iodine water and 1 drop of starch solution respectively. Add 10 drops of 0.8mol / L NaHCO to a test tube 3 Solution, see iodine water and the blue color of starch has not completely subsided; add 3 drops of 0.05mol / L Na to another test tube 2 CO 3 Solution, see the blue color of iodine water and starch completely recede. Example 3:

Embodiment 3

[0016] Take two small test tubes, add 0.5mL iodine water and 1 drop of starch solution respectively. Add 10 drops of 0.5mol / L NaHCO to a test tube 3 Solution, see iodine water and the blue color of starch has not completely subsided; add 1 drop of 0.1mol / L Na to another test tube 2 CO 3 Solution, see the blue color of iodine water and starch fades completely quickly. Example 4:

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PUM

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Abstract

The invention discloses a method for distinguishing NaHCO3 and Na2CO3 solution by iodine water. The method mainly includes the steps: taking two small test tubes and adding 0.5mL of iodine water and 0.00035mol / L iodine water into the test tubes respectively; respectively adding one drop of starch solution with the mass percentage concentration of 0.2% into the two small test tubes, and enabling the iodine water to turn blue; respectively adding less than 6 drops of NaHCO3 and Na2CO3 solution into the two small test tubes. Blue colors of iodine water-starch solution are not faded or completely faded by the NaHCO3 solution, but can be completely faded by the Na2CO3 solution, so that the colorless NaHCO3 and Na2CO3 solution can be distinguished. The method is high in reliability, good in repeatability, high in success rate, obvious in phenomenon, rich in characteristics, convenient to operate and high in safety and can be applied to the technical fields of chemistry, chemical engineering, medicine and the like, and drugs and materials are easily obtained.

Description

technical field [0001] The invention belongs to the technical fields of medicine, chemical industry and chemistry, and in particular relates to a kind of iodized water for identifying 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 3 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 李大塘焦银春李伶辉李晗
Owner HUNAN UNIV OF SCI & TECH