1 By convention a normal lens on a 35mm film camera (and thus a full-frame EOS digital SLR) has a focal length of 50mm or so. 2  A lens with a focal length of 35mm is considered ânormalâ for a cropped-frame EF-S camera.
Aspirin. One of the best known aromatic acetates is acetylsalicylic acid, or aspirin, which is prepared by the esterification of the phenolic hydroxyl group of salicylic acid. Aspirin possesses a number of properties that make it the most often recommended drug.
Your aspirin product as well as a commercial aspirin tablet will be compared to a standard 0.15% ferric-salicylate solution. In the presence of moisture, aspirin may decompose (hydrolysis) into salicylic acid and acetic acid.This reaction is the reverse of the synthesis reaction.The maximum allowable amount of free salicylic acid in an aspirin sample is 0.15% salicylic acid.n the presence of moisture, aspirin may decompose (hydrolysis) into salicylic acid and acetic acid. This reaction is the reverse of the synthesis reaction. The maximum allowable amount of free salicylic acid in an aspirin sample is 0.15% salicylic acid.