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.

Log

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