Can someone please edit (grammar wise) my short lab report for organic chemistry
ID: 985442 • Letter: C
Question
Can someone please edit (grammar wise) my short lab report for organic chemistry. I didn't get any data for the first experiment which is not good, so I really want to make sure that at least I have a good explanation. My professor still wants it concise but also clear.
The purpose of this laboratory experiment was to learn the technique of recrystallization by purifying benzoic acid from water. Theoretically, approximately 14 mL of room temperature water would dissolve the benzoic acid; however, the solid did not fully dissolve even after the addition of 55 mL. Due to possible systemic error, this indicates that potentially more than 1.0 g of benzoic acid was added to the flask. Therefore, no percent recovery and melting point could not be obtained for purifying benzoic acid.
The purpose of the second laboratory experiment was to determine a proper solvent for recrystallization of acetaminophen by using the solubility properties in five different solvents: acetonitrile, methanol, tetrahydrofuran, toluene, and acetone. Acetaminophen was only insoluble in toluene and acetonitrile at room temperature, but soluble in acetonitrile at warm temperature, which led to a confirmation of recrystallization of acetaminophen. On the other hand, acetaminophen was still insoluble with extra toluene at warm temperature. From these observations, acetonitrile would be a suitable solvent for recrystallization of acetaminophen.
Explanation / Answer
The solubility of benzoic acid in water is reported in the literature as,
2.70 g/L at 18 oC
3.44 g/L at 25 oC
Your text edited :
The purpose of this laboratory experiment was to learn the technique of recrystallization by purifying benzoic acid from water. Theoretically, approximately 14 mL of room temperature water would dissolve the given benzoic acid. However, the solid did not fully dissolve even after the addition of 55 mL of water. This could be due to the possible systemic error, indicating that potentially more than 1.0 g of benzoic acid was added to the flask. Therefore, no percent recovery and melting point could be obtained for the purification of benzoic acid from this experiment.
The purpose of the second laboratory experiment was to determine a proper solvent for recrystallization of acetaminophen by using the solubility properties in five different solvents: acetonitrile, methanol, tetrahydrofuran, toluene and acetone. Acetaminophen was insoluble in toluene at room temperature and at elevated temperatures. On the other hand, it was found to be insoluble in acetonitrile at room temperature but soluble at higher temperature (mention temperature value in degree C). Thus acetonitrile could be employed as a suitable solvent for recrystallization of acetaminophen.