Practical Flashcards
1
Q
How to check purity of a substance
A
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
2
Q
How to prepare a standard solution
A
Dissolve solid in beaker
Transfer solution to volumetric flask and transfer washings to flask
Make up to mark to 250cm^3 and invert flask multiple times
3
Q
How to go from haloalkane to alcohol
A
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
4
Q
How to do rate of reaction
A
Measure mass of Zn
Measure vol. of HCl
Measure gas vol. at timed intervals
