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.

IMG_20120402_105849.jpg
Test Tube with 4.908g of Cinnamic Acid

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.