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[Chemical Knowledge]：Chemical method to distinguish the small coup of acetaldehyde

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Acetaldehyde is a common organic compound, but in the laboratory, it is sometimes necessary
distinguish acetaldehyde from other compounds. Several common chemical methods to distinguish acetaldehyde are described below.

1. Ammonia Method

use ammonia to distinguish between acetaldehyde and ethanone. Drop a small amount of ammonia water into the substance to be tested. If a new white precipitate is formed, it indicates that the substance contains acetaldehyde.

2. Silver mirror method

silver nitrate and sodium hydroxide are mixed, and then the substance to be detected is added dropwise. If silver mirror is generated, acetaldehyde is contained. However, it should be noted that this method is easy to react with sugars and needs to be used with caution.

3. Sodium sulfite method

mix sodium sulfite solution with sodium hydroxide, and then add the substance to be detected dropwise. If white precipitate appears, it may be acetaldehyde.

4. urea method

urea and hydrochloric acid mixed, and then drop into the substance to be detected, if the formation of crystals, it may contain acetaldehyde.

, it should be noted that the above methods need to be operated in the chemical laboratory, and the safety of the experiment should be paid attention. In addition, these methods can only be used as the basis for preliminary differentiation, and finally the composition of the material needs to be confirmed by formal means. Knowledge of

chemistry is an essential part of the laboratory. Understanding the small tricks of chemical methods to distinguish acetaldehyde will help improve the accuracy and safety of chemical experiments. It is hoped that this paper can help readers to make better use of chemical knowledge and do a good job in experimental work.