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Use them only in the hood and be sure the hood fan is on! Excess chemicals must be disposed of in the plastic tub of water.This will convert the acetic anhydride to vinegar and dilute the sulfuric acid.
Don't let the acetic anhydride contact your skin and don't get the vapors in your eyes. Carefully add 8 drops of concentrated sulfuric acid (18 M H A.
At your lab bench, assemble a hot water bath using a 600 or 800 m L beaker and place the flask in the water bath as shown in Figure 1. After the water begins to boil, heat for an additional 15 minutes.
Apparently this comes from acetylation (A-), together with Spirin, part of the name for Meadow-sweet (Spiraea ulmaria), a plant rich in salicylates.
Friedrich Bayer, the employer of Hoffman, patented the name and began marketing the product in 1899. Bayer's company set up by himself, is generally reckoned to have been the first pharmaceutical company, and the production of aspirin is generally accepted to have laid the foundation of the modern pharmaceutical industry.
However, salicylic acid is bitter and irritates the stomach.
A German chemist named Felix Hoffman is credited with being the first to synthesize aspirin in 1897.If you spill some, wipe it up with a wet paper towel and throw the towel in the trash.The acetic anhydride and sulfuric acid can cause bad burns.Rinse the filter flask with water and discard the rinse water into the waste container under the hood.) C.Place the aspirin onto a doubled piece of paper towel and set aside to dry while performing the qualitative analysis of the aspirin.Make sure that the water bath is located directly under the hood at your lab bench. (NOTE: The hot water bath will be used again later in the procedure.) A.After heating, turn the bunsen burner off and CAREFULLY remove the flask from the water bath (remember it is hot! Label your flask containing the reaction mixture and place it in an ice bath and cool until the crystallization of the aspirin appears complete (approx. If crystals do not appear, you can scratch the walls of the flask with a stirring rod to induce crystallization. Collect the solid aspirin using a Buchner funnel and filter paper as shown in Figure 2.The salicylic acid and aspirin may cause irritation to your skin or eyes, but are basically not hazardous.An excess of these can be disposed of in the sink or, if packaged, in the trash.If the crystals do not all dissolve, add 2 m L more of the ethanol and continue to warm the mixture to dissolve the crystals. When the crystals are all dissolved, add 10 m L of deionized water, cover the beaker with a watch glass, and allow the solution to cool slowly on the lab bench undisturbed for about 10 minutes. After the 10 minutes cooling on the lab bench, complete the crystallization by placing the beaker and contents in the ice bath. If crystals do not appear, you can scratch the bottom of the beaker with a stirring rod to induce crystallization. Using a clean circle of filter paper, collect the purified aspirin by suction filtration as before. Dry the crystals by pulling air through them for about 15 minutes.(Discard the filtrate left in the filter flask into the waste container under the hood.