Tech 3: Purification and Characterization of Organic Solid

Question 1

What is recrystallization?

Answer 1

The solid will first be dissolved in a solvent and then later precipitated out.

Question 2

How do you choose an appropriate solvent for recrystallization?

Answer 2

The appropriate solvent to use for a recrystallization is one that will not dissolve the impure solid at room temp but will dissolve the solid when heated.

Question 3

What is the melting point defined as? How is it useful?

Answer 3

The melting point is defined as the temperature at which the solid and liquid phases of a compound are at equilibrium with each other.

helps with purity of a compound

Question 4

What is TLC?

Answer 4

Thin layer chromatography is a type of chromatography where the stationary phase is thinly spread over a plastic or aluminum backing. a small spot of solution of the substance to be tested is placed near one end of the plate using a capillary pipet.

Question 5

A TLC analysis can be used for three pieces of information?

Answer 5

1. purity
2. identify compound
3. monitor progress of a reaction