Discussion 9 - This was done to slow the movement of...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Lauren Taranow lmt827 11-13-11 Unique: 51070 Discussion 9: Aspirin Synthesis and Analysis This experiment involved synthesizing acetylsalicylic acid, commonly known as aspirin, and conducting a spectrophotometric analysis of the synthesized sample. A calibration curve was created using standards and the absorption coefficient of Beer’s law was determined from this curve. Lastly, this experiment taught how to determine the % purity as ell as the % yield of the sample. To synthesize aspirin, 2.0003 grams of salicylic acid was mixed with 5.0 ml acetic anhydride and 5 drops 85% phosphoric acid, then heated on a hot plate at 75 °C for about 20 minutes. Although the vapors had not finished releasing after 25 minutes, the mixture was taken off the hot plate because the reaction had taken so long and 20 ml distilled water was added. Once the mixture had cooled to room temperature, it was placed in an ice bath for about five minutes.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: This was done to slow the movement of molecules in the mixture to allow the formation of acetylsalicylic acid crystals to form. Acetic acid was also formed in the reaction, and to get rid of most of it, the cooled mixture was vacuum filtered through a Buchner funnel with pre-weighed filter paper and washed three times with cold, distilled water. During the vacuum suction, a significant amount of solid acetyl salicylic acid crystals were also filtered through the funnel and into the waste flask below, which may account for the low % yield of the final product. The solid crystals and filter paper were then transferred to a pre-weighed watch glass, covered with a Kim wipe, and stored for one week. A week later, the mass of the synthesized product was calculated to be 1.7931 grams, and still included an impurity, acetic acid....
View Full Document

This note was uploaded on 04/02/2012 for the course GER 38645 taught by Professor Horton during the Spring '08 term at University of Texas at Austin.

Ask a homework question - tutors are online