Question

1.The word “distillate” refers to

-the crude mixture before the distillation process begins.

-the material remaining in the original flask after the distillation is complete.

-the material collected in the receiving flask during the distillation.

-the glassware used to set up the distillation.

2.How full should the flask be before a distillation? What happens if it is too full? What happens if it is too empty?

3.A student wants to separate two liquids – their boiling points must differ by at least how much for a simple distillation to be effective?

4.True/False: When performing a distillation, you should make sure to continue heating until all of the liquid is gone, so as to maximize the amount of liquid that is collected.

Answer 1

1.

The word “distillate” refers to "the material collected in the receiving flask during the distillation".

2.

If the flask is too full you run the risk of the liquid 'bumping' or jumping from the flask through the distillation apparatus into your collection flask. When the volume is quite low the distillation will take a longer amount of time but will work fine.

3.

Simple distillation requires the liquids to have large boiling point differences (> 70^oC).

4.

It should be False:

When performing a distillation, you should left a little of the liquid in the flask, else the color impurity (or other impurities) might get collected in the receiving flask.