Practical

Question 1

How to check purity of a substance

Answer 1

Recrystalise
Dissolve solid in minimal amount of hot solvent
Cool solution and filter solid
Wash with cool solvent and dry
To check purity conduct melting point test and dry

Question 2

How to prepare a standard solution

Answer 2

Dissolve solid in water
Transfer solution to volumetric flask and wash/rinse
Make up to mark to 250cm^3 and invert flask multiple times

Question 3

How to go from haloalkane to alcohol

Answer 3

Use seperating funnel to seperate organic and aqueous layer
Collect organic aqueous layer as density is greater
Dry with anhydrous salt (MgSO4)
Collect fraction distillating at 102degrees

Question 4

How to do rate of reaction

Answer 4

Measure mass of Zn
Measure vol. of HCl
Measure gas vol. at timed intervals

Question 5

What is colour change for self indicating titrations

Answer 5

Colourless to yellow

Question 6

How to ensure reaction is complete

Answer 6

Reweigh to constant mass