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Chemical Methods for Distinguishing Acetaldehyde: A Little Trick 

Acetaldehyde is a common organic compound, but sometimes in the laboratory, it is necessary to distinguish it from other compounds. Below, several common chemical methods will be introduced to distinguish acetaldehyde

1. Ammonia water method 

uses ammonia water to distinguish acetaldehyde and ketone. Drop a small amount of ammonia water into the substance to be tested, and if a new white precipitate is generated, it indicates that the substance contains acetaldehyde

2. Silver mirror method: Mix silver nitrate with sodium hydroxide, and then add the substance to be tested dropwise. If a silver mirror is generated, it contains acetaldehyde. However, it should be noted that this method is prone to reacting with sugars and should be used with caution

3. Sodium sulfite method: Mix sodium sulfite solution with sodium hydroxide, and then add the substance to be tested dropwise. If a white precipitate appears, it may be acetaldehyde

4. Urea method: Mix urea with hydrochloric acid, and then add the substance to be tested dropwise. If crystallization occurs, it may contain acetaldehyde

It should be noted that the above methods need to be operated in a chemical laboratory and attention should be paid to experimental safety. Furthermore, these methods can only serve as a preliminary basis for differentiation, and ultimately require formal means to confirm the composition of the substance

Chemical knowledge is an essential part of the laboratory, and understanding the small tricks to distinguish acetaldehyde in chemical methods can help improve the accuracy and safety of chemical experiments. I hope this article can help readers better apply their knowledge of chemistry and do well in experimental work.