Researcher

Imran Husain

Objective

To determine the solubility of salicylic acid in benzene, cinnamic acid in methanol, and 2-phenylbutryic acid in cyclohexanone and analyze the role of heating time on saturation. The additivity of volumes is an assumption and the density of the solid is obtained from ChemSpider prediction.

Results

Sheet 1 (solute mass calculation)
Sheet 2 (solubiltiy measurements)

Discussion



Conclusion


Log

2010-07-28

11:00- A clean 10 ml and 2 ml volumetric flask were weighed
11:05- Pure solvents were weighed within the the volumetric flask and had their densities determined. Values are listed in Sheet2.
11:34- All solutes were weighed. Samples 1-4 were placed in separate 20 ml screw top test tubes. Samples 5 and 6 were placed in 12 ml screw top containers due to limited quantity of 2-phenylbutyric acid.2 samples were created of each solute compound.
11:45- Various solvents were added to all samples based on Sheet 1.
11:59- All samples were sonicated.
12:04- All samples were placed in a 40C water bath.
12:19- Samples 1,3, and 5 were removed from the 40C water bath and placed in 23C water bath. Solid residue could be seen at the bottom of samples 1 and 3. Sample 5 showed no precipitate implying full saturation had not occurred.
12:24- Samples 1,3, and 5 removed from 23C water bath. The samples were again sonicated and resulted in crystals precipitating out of the solution for sample 1 and 3.
12:27- Sample 1 was weighed
12:34- Sample 3 was weighed
12:40- Sample 5 was weighed
12:44- Samples 2,4, and 6 were removed from 40C water bath and placed in 23C water bath. Solid residue could be seen at the bottom of samples 2 and 4. Sample 6 showed no precipitate implying full saturation had not occurred. Pictures of the samples can be seen here.
12:49- Sample 2 was removed from 23C water bath and weighed in 10 ml volumtric flas[in both the 10 and 2 ml volumetrics? JCB] [How did you separate the supernatant from the solid? JCB]
12:54- Sample 4 was removed from 23C water bath and weighed [in both the 10 and 2 ml volumetrics? JCB]
12:58- Sample 6 was removed from 23C water bath and weighed [in both the 10 and 2 ml volumetrics? JCB] [There is no point in measuring sample 6 since there was no precipitate - you should have added more at 12:19 JCB]