Exp020

=Objective= To determine the solubility of 2-furaldehyde in methanol. =Procedure= A solution of 2-frualdehyde in methanol was prepared by adding methanol drop-wise to a small amount of 2-furaldehyde in a one dram vial. When the misciblity of the aldehyde was visually confirmed, the concentration of pure furaldehyde was taken as the concentration of its saturated solution in methanol.

=Results= [|Picture of the solution] =Discussion= During the addition of methanol to 2-furaldehyde there was no separation of layers at any time. Therefore it is inferred that Furan-2-carboxaldehyde is soluble in methanol in all proportions. Hence, it is deemed unnecessary to go further with any kind of UV spectral measurements. Concentration of a saturated solution of 2-furaldehyde in methanol is similar to the concentration when it is in its pure form; which can be defined using its density 1.15482 g/mL at 25 °C ([|Ref 1]). This can be rationalized by realizing that after an addition of an infinite amount of the aldehyde, the affect of concentration of methanol (now a solute instead of solvent) in the solution would become negligible. Therefore the concentration of pure 2-furaldehyde can be regarded as the concentration of its saturated solution in methanol; which is calculated to be 12.0M at room temperature.

=Conclusion= 2-Furaldehyde is fully miscible in methanol. The concentration of a saturated solution of 2-furaldehyde in methanol is 12.0M at room temperature.

2008-12-19
15:00 A solution of furfuraldehyde was made-up in a one dram vial by dissolving 83uL of furfuraldehyde in methanol (approximately 4mL). During the addition of methanol to 2-furaldehyde there was no separation of layers at any time. 15:45 A second trial was carried out when, in a clean 1 dram vial, 2mmol (176uL) of 2-frualdehyde was added, to this methanol was added drop-wise, the aldehyde dissolved methanol...at one stage, it appeared like there was some kind of distinction of two layers, however upon vortexing the solution for 10s, a homogenous light brown solution was obtained confirming the previous trial.

= References =


 * 1) Prediction of ternary liquid-liquid equilibrium from binary data (for the system furfural—iso-octane)—benzene;  Kenny, J. W.; [|Chemical Engineering Science, 1957, 6, 3, 116-122]

= =