1. PAPER CHROMATOGRAPHY
- First draw a pencil line on a piece of chromatography paper
- Then place a spot of the concentrate dye mixture on the base line
- Then put some spots of some pure dyes that you think the mixture might contain another colours on the same line as well
- The chromatography paper is put in a jar with the solvent
- Make sure that the solvent level is below the level of the spot otherwisw the dye will wash off into the solvent
- As the solvent moves up the paper, the dyes in the mixture separate from each other
- Observe and explain the result from your pratical and drawing the procedure (the apparatus) !
Is used to obtain a crystalline solid from a solution
SAFETY: Lab coat and safety glasses to be worn at all times and care to be taken when handling hot objects.
- Weight out 55 gram of Copper Sulphate
- Disolve with 100 ml of water
- Find the mass of crucible by itself.
- Find the mass of the crucible and copper sulphate
- Heat until powder become dark blue and reach the crystallisation point
- You can tell when this is by placing a drop of solution onto a cold tile from time to time (if crystals form quickly the crystallisation point has been reached)
- Let the concentrate solution cooling down
- Weight it out and and do the filtration process
- Leave for a few days to crystallise
- Draw the apparatus were use and calculate the crystals was form
- Do the analysis