Lab 1 orgo

Question 1

What is the purpose of recrystallization

Answer 1

Primary method for purifying solid organic compounds

Question 2

Why is the solvent heated and cooled in ice bath

Answer 2

Desired compound and impurities will dissolve in solvent. As solution cools, solubility decreases and solution is saturated enough that it begins to crystallize

Question 3

Why do we use a minimum amount of solvent to dissolve the solid that is to be recrystallized?

Answer 3

It cleans off any residual soluble impurities clinging to the surface of desired crystals

Question 4

What is the purpose of vacuum filtration?

Answer 4

Cleans off any residual soluble impurities clinging to the surface pf desired crystals

Question 5

What is the purpose of vaccum filtration?

Answer 5

-collect and dry the recrystallized product

Question 6

Vacuum filtration is a technique for

Answer 6

Separating a solid product from a solvent or liquid reaction mixture

Question 7

Why do we wash the solvent from vacuum filtration?

Answer 7

Because too much material cab stick to the dry agent and reduce yield

Question 8

How can you lose product with vacuum filtration

Answer 8

Washing with too much solvent

Question 9

State thr purpose of a drying agent

Answer 9

Removes excess water

Question 10

What effect does the rate of heating have on the melting point of a solid

Answer 10

Broad melting range means melting range will be too high