chem 1405 lab synthesis of aspirin –

1. Type a summary of the experimental procedure below, in your own words.

2.How many capillary tubes can be observed at once in the MelTemp apparatus shown in the video on eCampus?

  • Which of the compounds below are esters?Use the esters shown in the introduction of the experiment to help you identify the essential part of a chemical structure that makes a molecule an ester.
  • Calculate the theoretical yield of aspirin if you started with 1.35 g of salicylic acid.
  • What are some reasons that the actual yield of a reaction might be lower than the theoretical yield?
  • What are some reasons that the actual yield of a reaction might be higher than the theoretical yield?

Experimental Procedure Steps

1. A student weighed a 50-mL Erlenmeyer flask and found it to be 40.763 g. She added some salicylic acid, and found the new mass to be 42.806 g.

9. The student weighed a watch glass and a piece of filter paper, and found the mass to be 54.637 g.

15. After filtering and drying her aspirin, the watch glass, filter paper and aspirin were found to weigh

56.772 g.

18. The student packed a capillary tube with some of her aspirin and placed it in a Mel-Temp melting point apparatus. At 133.7 °C, she observed some of the white crystals starting to turn into a liquid. All of the crystals had melted at 135.2 °C

Use the data provided to complete the data table on the next page. Calculate the theoretical yield and percent yield of aspirin and enter it in the spaces provided on the Data Sheet.

Refer to the Experimental Data provided, and enter it into the table:


Mass of Erlenmeyer Flask

Mass of Erlenmeyer Flask + Salicylic Acid

Mass of Salicylic Acid

Mass of Filter Paper + Watch Glass

Mass of Filter Paper + Watch Glass + Aspirin

Mass of Aspirin (actual yield)

Melting Point Range

Calculate the theoretical yield, and type your answer below:

Theoretical Yield:

Calculate the percent yield, and type your answer below:

% Yield: