Preparation and crystallization of aspirin

Stir the salicyclic acid-anhydride mixture with a swirling motion until all the solid has dissolved. Using a clean circle of filter paper, collect the purified aspirin by suction filtration as before.

synthesis of aspirin lab report abstract

H2SO4 use a dropper, H2SO4 is highly corrosive and swirl the flask gently until the salicylic acid dissolves. At the first sign of melting of each solid, record the temperature.

The product will appear as a solid mass when crystallization is completed.

Preparation and crystallization of aspirin

Polyesters are often made from dicarboxylic acids and diols. Obtain a sample of about 4 g of salicyclic acid and determine its mass to the nearest 0. Write a structure for the ester formed from acetic acid and ethanol. Place your aspirin in the jar labeled "Student Prep Aspirin". We will use this fact to help purifiy the aspirin. Using a clean circle of filter paper, collect the purified aspirin by suction filtration as before. Rinse the filter flask with water and discard the rinse water into the waste container under the hood. Push the open end of the shorter tube into some dry, powdered commerical aspirin. In this experiment you will synthesize aspirin acetylsalicylic acid, C9H8O4 , purify it, and determine the percent yield. Carefully add 8 drops of concentrated sulfuric acid 18 M H2SO4 , a catalyst, to the flask.

Collect the product by vacuum filtration and rinse out of the flask with a few milliliters of cold petroleum ether. Wash the filter funnel with water and discard the rinse water into the waste container under the hood.

Observe the colour.

Synthesis of aspirin mechanism

Shake each test tube and observe the colors produced. Make sure that the product is completely dissolved while gently and continuously heating on a steam bath. The product will appear as a solid mass when crystallization is completed. At the first sign of melting of each solid, record the temperature. The aspirin is then collected, purified by recrystallization, and its melting temperature measured. Rinse the Erlenmeyer with 10 mL of ice water, of ice water, and add this rinse water to the rest of the mixture. We will use this fact to help purifiy the aspirin. Using a weigh boat, weigh out 5.

Cooling The Reaction Mixture A. Aspirin does not like to dissolve in water.

recrystallization of aspirin
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Lab_15_Aspirin_Prep_and_Pure