EXP172

=Researcher= Imran Husain =Objective= To determine the solubility of salicylic acid in benzene, cinnamic acid in methanol, 2-phenylbutryic acid in cyclohexanone, and benzoic acid in methanol through density measurements. =Results= [|Sheet 1 (planning)] [|Sheet 2 (measurements)] =Discussion= The observed solubility of the different solutes obtained in this experiment compared to other experiments were closer for some samples than others. The solubility noted for salicylic acid in benzene...

=Conclusion= Determining the solubility of a solute within a given solvent requires saturation. If saturation is not achieved then actual solubility can not be determined. To determine if saturation has occurred the solution must be heated and allowed to cool. As the solution is heated more solute is dissolved and the cooling procedure allows crystals to be visualized as the solvent loses the ability to dissolve solute with the falling temperature. =Log=

2010-07-15
10:51= Measured salicylic acid in 20 ml screw top test tube (value in spreadsheet 1)labeled Sample 2 10:59= Measured cinnamic acid in 20 ml screw top test tube (value in spreadsheet 1) labeled sample 4 11:10= Measured 2-phenylbutryic acid in 20 ml screw top test tube(value in spreadsheet 1) labeled sample 6 11:22= Measured benzoic acid in 20 ml screw top test tube (value in spreadsheet 1) labeled sample 8 11:48= Placed benzene within sample 1 and sonicated for 2 minutes before placing in 40C waterbath 11:57= Samples 2 through 4 were mixed with respective solvents and sonicated for 5 minutes before placing in 40C waterbath 12:04= Samples 2 through 4 were placed in 40C waterbath 12:20= Sample 1 was removed from 40C waterbath and placed in 25C waterbath 12:35= Sample 2 through 4 were removed from 40C waterbath and placed in 25C waterbath 12:40= 10 ml of sample 2 was removed and placed in a 10 ml volumetric flask for measurement. The supernatant was clear and did not require filtering. 12:45= Sample 1 was created with benzene alone in a 10 ml volumetric flask and measured 12:50= 10 ml of sample 4 and 6 were removed and placed in a 10 ml volumetric flask for measurement. White precipitate equalling roughly half an inch could be seen at the bottom of the tube in sample 4. Sample 6 had a small amount of precipitate that coated the bottom of the test tube allowing a filterless transfer. 12:55= Sample 2 and 3 were created with respective solvents and were measured. 13:00= 5 ml of sample 8 was removed and placed in a 5 ml volumetric flask for measurement ( a smaller volumetric flask was used due to smaller amount of solution than others samples). A large amount of precipitate was located at the bottom of the tube. Filtering was not required.