Recrystallization Chem Lab

Topics: Chemistry, Crystal, Solid Pages: 3 (507 words) Published: March 4, 2015
Adeoti Taylor
Chem2583 Organic Chemistry Laboratory
Class ID:8622098
Organic Lab 2 2583-04
Instructor: Andy Szalkiewicz
9/30/2014
Recrystallization
Objective/Abstract:
The purpose of this lab is to purify solids contaminated by relatively small amount of impurities by a technique called Recrystallization. Compounds that have different solubility at different temperature usually can be recrystallized. Formulas and Structures:

Benzoic Acid

Methanol
Percent Recovery: Indicates how much of the active ingredient was able to recover after the purification method.

Weight of benzoic acid obtained after recrystallization % Recovered = x100 Weight of benzoic acid before recrystallization

Table of Physical Data:
Weight of Compounds before and after recrystallization

Initial Weight(mg)
Final Weight(mg)
Benzoic Acid
0.093
0.056
Methanol & Benzoic
0.080
0.062

Melting Point data
Benzoic Acid (°C)
Methanol & Benzoic(°C)
123-125
119-121

Experimental Procedure
I had to recrystallize 0.093mg of benzoic acid from the minimum amount of water. I turned on the electrical heated sand bath and added the sold and a boiling stick to the test tube and gradually added desired hot water. After boiling begins, I continued to add water until the sold dissolved I removed the boiling stick, I corked the tube, clamped as it cooled, and observed recrystallization begin. I turned the vacuum filtration to collect the crystals.

In another reaction tube, I dissolved 0.080mg of benzoic acid in the minimum volume of hot methanol; I added drops of water to the hot solution. After the crystals form and recrystallization begin. I allowed the tube to cool slowly at room temperature, then cool in iced water and gather the crystals. Then I used the spatula to collect a tip of...
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