EXP340

=Researcher= Linh Bui

=Objective= Determine the solubility of (trans) - cinnamic acid in methanol using density method. The additivity of volumes is an assumption and the density of (trans) - cinnamic acid is obtained from [|ChemSpider] **[remove span tags JCB]**

=Procedure= Cinnamic acid was moderately dissolved in methanol at room temperature. Transferred about 2 grams of cinnamic acid and 5 mL of methanol in a test tube. **[dissolved would imply that all the solid went into solution - is that accurate? JCB]** Then the mixture was attached to the shake plate and placed in the water bath at 25°C for at least 24 hours **[be more specific JCB]** **[do you mean this? JCB]** **[is it sufficient to just place the test tube into the bath? JCB]** Transferred 1 mL of the supernatant to a 1 mL volumetric flask. Weighed the flask and recorded its mass.

=Results= The solibility of cinnamic acid in methanol found by using the density method was 1.281 M. **[remove span tags JCB]**

[|ONS-EXP 340-Spreadsheet]

=Discussion= [|Previous measurements of the solubility of cinnamic acid in methanol] had range from 1.226 M to 1.520 M. The solubility of cinnamic acid in this experiment was 1.281 M. Therefore, the solubility found was likely to lie in the range above. **[precise is not an appropriate term here JCB]**

=Conclusion= The solubility of (trans) - cinnamic acid in methanol is 1.281 M.
 * [add to solsum sheet JCB]**

=Log=

2012-10-25
13:25 - Weighed out 2.0010g of cinnamic acid and transferred to a clean 20 mL test tube. 13:35 - Transferred 5.00 mL of methanol to the test tube containing cinnamic acid. 13:36 - Capped the test tube with a screw cap and sealed it with parafilm. 13:37 - Shook the mixture several times. 13:41 - Observed the mixture: really light yellow liquid on the top and a thick milky white layer at the bottom of the test tube. 13:47 - Attached the sealed test tube to the shake flask apparatus and placed it in the 25°C water bath (vortex at level 3).

2012-11-05
10:21 - Weighed and recorded the mass of an empty 1 mL volumetric flask. **[was vortex still running? JCB]** 10:25 - Filled the flask with 1 mL of methanol. 10:26 - Weighed the flask containing 1 mL of methanol. 10:32 - Weighed that 1 mL volumetric flask again after washing and air drying it. 10:34 - Took the test tube out of the water bath. 10:36 - Transferred 1 mL of the supernatant on the top of the mixture into the 1 mL volumetric flask by using a pipet. 10:39 - Weighed the volumetric flask containing the supernatant.