Acetic anhydride

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The hydrolysis of aspirin in the absence and presence of rabbit serum Results In both saline and rabbit serum solutions, as the aspirin concentration increased, the salicylic acid concentration also increased. However, the salicylic acid concentration achieved in the saline solution at increasing concentrations of aspirin was not equivalent to the increase attained in the rabbit serum. In serum solution, the amount of salicylic acid metabolized from aspirin was always at least double that achieved

Salicylic Acid Testing Observations - The indicator that showed the presence of Salicylic Acid in the aspirin was the change in color from white to dark purple. The color that indicated the lack of Salicylic Acid was light yellow. Conclusion The weight of crude aspirin obtained from 4g of Salicylic Acid was 4.74g. After recrystallization, approximately 2.9g of recrystallized aspirin was obtained. After calculating the molar mass of Salicylic Acid and aspirin, the theoretically obtainable weight

an esterification reaction. Initially, the proton, i.e. the hydrogen ion, from the acid attacks the acetic anhydride and attaches itself on a double bond oxygen. This makes the compound more electrophilic, meaning that it has a higher affinity for electrons. This is what sets off the reaction. The salicylic acid then acts as an alcohol and attaches its OH group onto a carbon on the acetic anhydride. Then, the hydrogen from the OH group (the alcohol group) of the salicylic acid falls off, forming a

amides a more efficiently anhydride and amine react, this in result creates an amide and carbocyclic acid. Esters and amides have similar structures and are both produced by reaction with amine, but amides and esters are very different in their chemical and physical properties. Amides unlike esters can form hydrogen bonds and therefore typically have higher melting points and are typically being pH neutral. In this part of the experiment, 4-aminophenol(1g) and acetic anhydride(1.25ml) will react with

smell. 4. Allow the flask to cool down to room temperature on the lab bench before placing it into the ice-water bath. 5. Break up the crystals with a glass stir rod and slowly add 20 mL of pre-cooled distilled water to destroy an unreacted acetic anhydride. Cool the flask for several minutes to get as many crystals as possible. 6. Use vacuum filtration to collect the ASA crystals. Wash the crystals using about 10 mL of ice cold water three times. In order to allow the cold water to destroy impurities

then transferred into a 150 mL beaker. 3. Using a 10 mL graduated cylinder, 9.20 mL of acetic anhydride was measured. A watch glass was placed on top of the graduated cylinder to prevent the spread of acetic anhydride fumes. 4. The acetic anhydride was then added to the salicylic acid. This step was performed under a fume hood. 5. Next, 15 drops of 85% phosphoric acid were added to the solution of acetic anhydride and salicylic acid. The solution became warm after adding the phosphoric acid. 6. The

acetylation with acetic anhydride.A known weight of the alcohol is acetylated with acetic anhydride in presence of dry pyridine. The amount of acetic anhydride is used in the excess is hydrolysed by water to acetic acid at the end of reaction. Acetic acid so produced is titrated against standard alkali solution to determine the amount of the unreacted acetic anhydride. Reaction: (CHsCO)2 + H2O → 2CH3COOH Reagents: Distilled acetic anhydride, 0.5 N sodium hydroxide, dry pyridine, Acetic anhydride in pyridine:

Introduction Ways to Synthesize Acetanilide The goal of this experiment was to synthesize acetanilide form aniline and acetic anhydride. Even though this was the reactants used in the laboratory, there are other reactions that would result in the same compound. One way to produce acetanilide is to use aniline but to replace the acetic anhydride with acetonitrile and add deionized water. Even though this reaction has a ninety-eight percent yield, the consequence is that the reactants need to be heated

With the dried mass of the product the balanced equation of the reaction, between 4-aminophenol and acetic anhydride can be calculated. The percent yield of said product can then be calculated by divided the calculated mass by the theoretical mass. Using the characteristics of alcohols and pH, the 4-aminophenol and acetaminophen produced can be tested to categorize