Exp174

=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]**