Recrystallization lab report essay

The flask was swirled to dissolve the salicylic acid. The flask was placed in a hot water bath for ten minutes.

Recrystallization lab report essay

Relying on differences in solubility, an extraction was performed on a mixture of benzoic acid and acetanilide in an attempt to isolate the two compounds.

Additionally, purification by recrystallization of the isolated products was carried out. The observed values of the pure solids were then compared to the known, pure literature values of each substance in order to determine the effectiveness of the extraction and purification techniques used.

A separatory funnel was cleaned, dried and prepared on a stable ring stand under the fume hood. A mixture of benzoic acid and acetanilide was obtained and weighed to approximately 4 grams and added to the separatory funnel. Wearing neoprene gloves, approximately 30 mL methylene chloride was added next.

The funnel was closed and inverted, and ventilated frequently to release pressure from the system. Next, the funnel was shaken again taking care to ventilate often and the mixture was placed back in the ring stand and allowed to separate. The layers were separated into different beakers and labeled.


The acetanilide mixture was placed back into the funnel and treated with a second portion of approximately 24 mL KOH. The procedure for separation was repeated and again the bottom layer was separated into the acetanilide flask, while the top layer went into the original benzoate flask.

With the separation completed, purification of each compound was then carried out. The purification of acetanilide was accomplished by treatment with anhydrous magnesium sulfate followed by gravity filtration into a round bottom flask. The magnesium sulfate allowed for a removal of any remaining water drawn in from the separation process.

Recrystallization lab report essay

The remaining dichloromethane was evaporated in a warm bath using a rotary evaporator. The remaining crystals represented the purified product and were kept in the flask for further air drying.

For the benzoate salt in solution, concentrated HCl was added to give the desired product of benzoic acid. Precipitation of the benzoic acid was observed. In order to ensure acidity, a litmus test was administered and showed positive.

To obtain the purified crystals, vacuum filtration was used and care was taken to ensure that the filter paper was wet in order to seal the holes well. The crystals were collected and stored in the Buchner funnel for further air drying. Both products were allowed to air dry for one week, thereupon the characterizations of each were analyzed using an analytical balance for weight and a Vac digital melting point apparatus for MP.

The MP apparatus was tested against a known substance for accuracy determination. The procedure was carried out as planned, and the following data points, including literature values, were obtained:Acetylsalicylic Acid Lab This Lab Report Acetylsalicylic Acid Lab and other 64,+ term papers, college essay examples and free essays are available now on Autor: review • December 3, • Lab Report • 1, Words (6 Pages) • 3, Views.

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Base Extraction of Benzoic Acid from Acetanilide - Essay