Try Magic Notes and save time.Try it free
Try Magic Notes and save timeCrush your year with the magic of personalized studying.Try it free

Organic chem lab exam 1

Click the card to flip 👆
1 / 6
1 / 6
Terms in this set (6)
A successful fractional distillation depends upon maintaining a temperature gradient within the column. Ideally, the temperature at the bottom of the column should be similar to the boiling temperature of the solution in the pot, and it should decrease continuously in the column until it reaches the boiling point of the more volatile component at the top of the column.If the distillation flask is heated too rapidly, the whole column will heat up almost uniformly and eliminate the desired temperature gradient. The result will be minimal fractionation and separation of the components.
The success of a fractional distillation requires that the material passing through the column condense and vaporize within the column. The column must be as vertical as possible to maximize contact with the column packing and the condensate as it passes back down the column. If the condensate runs down the side of the column rather than through the packing, there will be minimum contact between liquid and vapor.
If the mercury bulb is too low, high temperature readings are observed because the bulb is in contact with liquid and vapor having a higher temperature than the vapor entering the condenser.
b. If the mercury bulb is too high, low temperature readings are observed, because the bulb is not in full contact with the vapor entering the condenser.