EXP275

=Researcher= Valentine Anyiam =Objective= Determination of the solubility of cinnamic acid in methanol via the Density method while following protocol of EXP229 =Procedure= Create a mixture of 5g of Cinnamic Acid and 11mL of methanol within a test tube. Place the mixture within a water bath between 45-50C until the solution dissolves (the solid will not dissolve completely). Transfer the supernatant into another test tube and place the test tube within a water bath at room temperature for several minutes. Using a volumetric flask obtain the weight of pure methanol using a balance pan. Then take the methanol solution out of the water bath, decant it into the same volumetric flask and record the weight of the solution. =Results= [|Density Sheet 1] The concentration of cinnamic acid dissolved in methanol within a 1mL and 2mL volumetric flask was determined to be 1.37M and 1.32M respectively.

=Discussion= The solubility of cinnamic acid in methanol was found to be 1.274M at 24C in Exp229. Also, the solubility of cinnamic acid in methanol was to range from 1.2-1.38M in [|previous experiments]. The results from this experiment show agreement with the results from the other experiments. =Conclusion= The solubility of cinnamic acid in methanol at 23C was determined to be 1.32-1.37M. This is consistent with the results found from Exp229 and previous experiments. =Log=

2012-04-02
10:17 The Water Bath was set to 45C. Current temperature was at 18C. 10:32 Weighed out 4.908g of Cinnamic Acid and transferred solid to a test tube. 10:37 Water Bath temperature at 45C. 10:57 Water Bath temperature at 50C. 10:58 Picture1 was taken of the test tube containing cinnamic acid. 11:05 Water Bath temperature at 50C. Added 11mL of Methanol to test tube with cinnamic acid. Test tube was capped with screw cap, covered with para-film and then placed inside the Water Bath. 13:16 Water Bath temperature at 50C. Some of the cinnamic acid dissolved within the solution while some of the solid remained. 13:18 Supernatant was poured off into another clean test tube. 13:37 New test tube with supernatant was capped with a screw cap, covered with para-film and then suspended within water at 25C. 13:52 A 1mL empty flask + cap was weighed to be 49.1798g. 13:55 1mL of methanol was weighed within the flask + cap to be 49.9655g. 13:57 A 2mL empty flask + cap was weighed to be 18.9364g. 14:09 2mL of methanol was weighed within the flask + cap to be 20.5248g. 14:10 The temperature of the water containing the supernatant was now at 23C. Both flasks were emptied and air dried. 14:18 Temperature of the water containing the supernatant is still at 23C. 1mL of supernatant was weighed within the flask + cap to be 50.0404g. 2mL of supernatant was weighed within the flask + cap to be 20.6670g.