Practicals

Question 1

Recrystallisation

Answer 1

Dissolve solid in minimum amount of hot solvent
Filter through filter paper and allow to cool and form crystals
Filter under reduced pressure
Wash crystals with ice cold solvent and allow to dry

Question 2

Describe diltration under reduced pressure

Answer 2

Pour mixture of solid and liquid into a Buchner funnel containing filter paper
Attach vacuum pump to the side
Reduced pressure in the flask forces liquid through funnel

Question 3

DDescribe melting point

Answer 3

Put small sample of solid into capillary tube and use a melting point apparatus to raise temp very slowly
Record range

Question 4

Describe reflux

Answer 4

Mixture is continuously boild and condensed

Question 5

Describe distillation

Answer 5

Liquids are separated based on boiling point

Question 6

Describe separating funnel

Answer 6

Separates organic layer from aqueous layer

Question 7

Describe drying

Answer 7

Organic liquid shaken with anhydrous salt (MgSO2) to remove water and then filter to remove drying agent

Question 8

Describe Mass Spec

Answer 8

Number of peaks tells use how many isotope present
M/Z = isotopic mass
Height = abundance