Aspirin (CAS 50-78-2, also called Acetylsalicylic acid) [Aspirin, 2 - (acetoxy) benzoic acid, also known as acetylsalicylic acid ) is a white crystalline or crystalline powder, odorless or slightly acetic odor, slightly soluble in water, easily soluble in ethanol, soluble in ether, chloroform, and the aqueous solution is acidic. This product is a derivative of salicylic acid. After nearly a hundred years of clinical application, it has proved to be effective in relieving mild or moderate pain, such as toothache, headache, neuralgia, muscle aches and dysmenorrhea. It is also used to reduce fever and treat rheumatic pain in febrile diseases such as colds and flu. In recent years, it has been found that aspirin can inhibit platelet aggregation and prevent thrombosis. It is clinically used to prevent the formation of thrombosis after transient ischemic attack, myocardial infarction, artificial heart valve and venous fistula or other operations.
Physical and chemical properties
Properties: white acicular or tabular crystal or crystalline powder. Odorless, slightly sour.
Molecular chemical formula: C9H8O4
Molecular relative mass: 180.16
CAS No. 50-78-2 [98]
Melting point: 136-140 ℃
Boiling point: 321.4 ° C at 760 mmHg
Flash point: 131.1 ° C
Water solubility: 3.3 g/L (20 ℃)
Steam pressure: 0.000124mmHg at 25 ° C
Solubility: slightly soluble in water, soluble in ethanol, ether, chloroform, also soluble in strong alkaline solution, and decomposed at the same time.
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