EXP229

=Researcher= Matthew McBride =Objective= To determine the solubility of //trans//-cinnamic acid in methanol through the use of the [|density method] .**[Link to description of the method as usual JCB]** =Procedure= Cinnamic acid was dissolved in methanol using a 45C water bath to create a saturated solution. The supernatant of this solution was removed and placed in a 25C water bath and a precipitate was allowed to form. The solution was removed from the precipitate and weighed using a 5mL volumetric flask. **[Provide very brief procedure JCB]** =Results= [|ONSEXP229-Sheet 1] Using a 5mL volumetric flask, the molarity of a methanol solution saturated with cinnamic acid was found to be 1.274 M
 * [You didn't use the right solvent density in the spreadsheet and I fixed it (in red) and updated the final result. JCB]**

=Discussion= [|Previous experiments] have found the solubility of cinnamic acid in methanol to range from 1.2-1.38 M with a mean of 1.31 M. The 1.274 M found in this experiment showed excellent agreement. =Conclusion= The density method found that the solubility of cinnamic acid in methanol was 1.274 M at 24C. =Log=

2011-11-03
13:08 - Created water bath in 150mL beaker on the hot plate. Initial water temperature was 30C. 13:11 - 4.9g of cinnamic acid was transfered to a 20mL glass test tube. Approximately 11mL of methanol was added to the tube. 13:51 - Test tube was capped with a screw cap and placed in the water bath at a temperature of 45C. 13:53 - Cinnamic acid was observed going into the solution. 13:55 - Water bath was at a temperature of 44C. 13:59 - Water bath was at a temperature of 42C. 14:08 - Test tube was removed from the water bath and the supernatant was poured into another 20mL test tube. The tube with supernatant was capped with a screw cap, sealed with parafilm, **[and parafilm? JCB]** and placed in a 25C water bath. 14:11 - Precipitation from the solution was visible. 14:14 - Water bath was at a temperature of 24C. 14:19 - Measured mass of empty 5mL flask on the scale. 14:26 - Measured mass of 5mL flask filled with methanol. 14:31 - Flask was dried by rinsing with acetone [How? JCB] and the mass of the empty 5mL flask was obtained. 14:39 - Final temperature of the water bath was 24C. Transferred the supernatant from the precipitate to the 5mL volumetric flask. Measured the mass of the 5mL flask containing the supernatant.