Recrystallization 29.08.2019
 Recrystallization Article


Lem Therese D. Delos Ama, Glenn Dale M. Desquitado, David Carlos M. Drapesa, Arianne Valerie B. Escritor, Elisha Ellis R. Esteva

Group 4 2B Medical Technology Organic Hormone balance Laboratory


In this experiment, acetanilide was used as the pure organic and natural compound. Acetylation of aniline and acetic anhydride brings the crude product or perhaps crude acetanilide. The elementary acetanilide was purified byВ dissolving it in hotВ water after which the solution was cooled gradually by placingВ in an ice bath. В The yielded uric acid were natural acetanilide since molecules ofВ other compounds present in the raw acetanilide were excluded through the growing ravenscroft lattice. Lattice is aВ fixed and stiff arrangement of atoms, substances or ions. The shedding point of the pure acetanilide was then simply determined by placing it within a capillary tube then engrossed it for the oil bathtub with a thermometer and was monitored. The percentage yield determined was thirty seven. 04%.


Recrystallization is the easiest and most widely used operation intended for purifying organic and natural solids that differ inside their solubility in different temp. The objectives ofВ this test are to cleanse an impure solid, and calculate their percentage yield. It is a way of effective restoration of a compound mixed with one other to produce a pure compound. With the differences in solubility you can separate them by dissolving the mixture then filter out the impurities in the act.

From this experiment, aniline is the major compound accustomed to acquire Acetanilide, which is our product. Anilineor phenylamine(IUPAC name) with a formulation ofВ C6H5NH2, is definitely an odorless, oily, poisonous benzene type.

Figure 1 . Framework of Aniline

Acetanilide may be the product of this recrystallization. Acetanilide or N-phenylacetamide (IUPAC name) with aВ formula ofВ C6H5NH(COCH3) is definitely produced by adding acetic anhydride with Aniline.

Figure 2 . Structure of Acetanilide

The experiment's objectives are the next:

* Synthesize acetanilide by the acetylation of aniline

2. Purify raw acetanilide product by recrystallization


A. Compounds tested (or samples used)


B. Process

A corn-grain measured amount of pure acetanilide was deposited into three (3) different test tubes. Distilled normal water was in that case added to one test pipe, hexane to a new, and methanol to the previous. The test pipes were shaken and placed in a normal water bath pertaining to 1-5minutes. Following heating, test tubes were placed right away to an ice bath. The solubility in the pure acetanilide in the distinct solvents by varying temperature was mentioned. This process is going to determine the correct and the finest solvent that could yield natural acetanilide throughout the acetylation of aniline and acetic anhydride.

Figure 3. Filtration in the pure acetanilide and the exclusion of the pollutants In an Erlenmeyer flask, 2mL ofВ aniline was added with 20mL of distilled water then little by little added with 3mL of acetic anhydride. The flask was place in an ice bath toВ hasten the crystallization of the remedy. When theВ crystals were completely formed, the answer was filteredВ to obtain the produced crystals, which will be the raw acetanilide. After filtering, the crystals had been dried by simply pressing with filterВ paper which will sip the remaining liquid. This technique is the 1st crystallization within the experiment.

Figure 4. The pure acetanilide with the thermometer in the melting point willpower.

Figure 5. The combination of aniline mixed with acetic anhydride forming the crude acetanilide When the crude Acetanilide was completely dry, 20mL of normal water wasВ added which is the selected recrystallizing solvent. The solution was subjected within a water bath until each of the solid dissolves. Since the solution became coloured, activated a lot was used to eliminate the coloured impurities and was heated again. After heating, the solution was blocked immediately while it was still popular and the filtrateВ was placed on an ice...

References: Ault A. (1983). Approaches and Tests for Organic Chemistry Last Edition. six Wells Method, Newtown, Massachusetts, USA.: AllynВ and Bacon Inc. Pp. В 44-61.

Lehman, M. W. (2009). Operational Organic Chemistry A Problem-Solving Way of the LaboratoryCourse Fourth Edition. UpperВ Saddle Water, New Jersey, USA. В Paerson Education, Inc. Pp. 692-706

Recrystallization (n. d)

RecrystallizationВ (n. d. )В

Recyrstallization Formal Report (n. d)

Wigal C. (n. deb. ) Cleansing Acetanilide by Recrystallization. Lebanon Velley University.В ts/1087540703X. pdf

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