How is the synthesis of aspirin carried out?
The synthesis of aspirin may be achieved in one simple step, O-acetylation of salicylic acid (Figure 1), which is incorporated into many undergraduate synthetic chemistry laboratory courses. The purity of the product as a pharmaceutical is crucial, and
What are dependent variables in synthesis and characterization of aspirin?
Synthesis and Characterization of Aspirin. The dependent variables in the experiment are the variables that are not completely controllable: percent yield, speed of crystallization, co-crystallization of Salicylic acid or Acetic Acid, or anything else not changeable by the person running the experiment.
What kind of organic molecule is aspirin made out of?
The organic molecule actually synthesized in this experiment is Acetylsalicylic Acid, commonly known as Aspirin. Acetylsalicylic Acid is derived from Salicylic acid, which then reacts with Acetyl Anhydride as per the following reaction in Figure 1.1:
How is acetic anhydride used to prepare aspirin?
For preparation of Aspirin, acetic anhydride is added to the measured amount of salicylic acid. Sulphuric acid is added and heated for a short period to complete reaction.
Synthesis of Aspirin Aspirin is the single most manufactured drug in the world. Aspirin’s chemical name is acetylsalicylic acid, and it is synthesized from the reaction of acetic anhydride with salicylic acid in the presence of phos-phoric acid as a catalyst. The by-product is acetic acid (Figure 5.1).
Who was the first person to invent aspirin?
Felix Hoffmann, a German chemist, produced a stable form of acetylsalicylic acid, more commonly known as aspirin; in 1897. Aspirin is a derivative of salicylic acid that is a mild, nonnarcotic analgesic useful in the relief of headache and muscle and joint aches.
How does the recrystallisation of aspirin take place?
Water is added once removed from heat with addition of cold water and suction filtration is carried out. As for recrystallisation of aspirin, collected crude product prepared in preparation of aspirin which is impure is dissolved in ethanol and hot distilled water is added to the solution.
How is aspirin collected in a vacuum filtration system?
The solid aspirin will be collected using vacuum filtration. Any other reaction ingredients that are soluble (this includes acetic acid, phosphoric acid, and water) will pass through the filter paper. The collected aspirin will be tested for its purity using FeCl 3 (aq) Iron (III) ion reacts with phenols to form a purple complex.
How much aspirin can one mole of salicylic acid produce?
Note: based on the molar masses in the table below, 138.12 g of salicylic acid would produce a maxium (theoretical) of 180.16 grams of aspirin (1 mole salicylic acid produces 1 mole aspirin). You will not use 1 mole of salicylic acid.
How do you calculate the melting point of aspirin?
Once solid dissolved, weigh the watch glass and filter paper, use the filter paper to carry out suction filtration, place crystals on watch glass, weigh the dried crystal and calculate the weight of the aspirin. Then, determine the melting point of aspirin using necessary apparatus.