Salicylic Acid preparation Lab 1

Topics: Chemistry, Salicylic acid, Methyl salicylate Pages: 4 (531 words) Published: March 7, 2015
Experiment #1: Synthesis of Salicylic Acid From Wintergreen Oil By: Asad Razzaq
TA:
Date: 18/01/2015
222/Lab Section 8

Introduction
Salicylic acid, used in production of substances used worldwide such as commonly used analgesic drug aspirin(cite), can be obtained from natural resources such as wintergreen oil or can be synthesized. Through a series of chemical reactions with cheap raw materials beginning with beginning with methyl salicylate and, it is a cheaper and more efficient method of making salicylic acid from natural resource of benzene. The purpose of the experiment is to prepare salicylic acid methyl salicylate, and compare it to the one already made naturally from benzene to determine any differences based on physical properties [1].

Of the techniques to be used, heating under reflux is a common laboratory process to increase the rate of the reactions taking place in order to save time. Important process of isolation that is commonly used is to vacuum filter a solution that allows for the separation of insoluble substances present in a solution. The decision to choose vacuum filtration against another method such as gravity filtration is due to the suction pressure in vacuum filtration that creates faster and more effective suction [1]. Once separated, purifying a substance can occur by recrystallizing the solid substance by heating it in water to its boiling point, making it fully dissolved and soluble due to the added source of energy. Then reversing the conditions by cooling the solution, allows pure substance to form crystals at a higher temperature with other ‘like’ crystals that make the substance more pure, while the impurities remain dissolved in the solution till the solution is further cooled[2].

During the process of preparing salicylic acid from methyl salicylate, two main reactions take place. Beginning with the addition of sodium hydroxide that readily dissociates into sodium...

References: 1. John, W. Lehman. Operational Organic Chemistry: A Problem-Solving Approach to The Laboratory Course. 4thEdition. 2009. Pearson-Prantice Hall,Upper Saddle River,NJ.p. L9–L10.
2. Recrystallization. Chemwiki. UcDavis. Web. 2014
http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Case_Studies/RECRYSTALLIZATION
3. Fried, Bernard. Thin Layer Chromatography. 4th Edition. Marcel Dekker, Inc. New York, 2005. Print.
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