1.
For all the information you put on your flashcards, did you get that info from the Free Science Lessons videos or did you use another textbook, etc?
2.
Did you also get the additional info (e.g the paper is called the stationery phase) from these videos /textbooks too?
1.
For all the information you put on your flashcards, did you get that info from the Free Science Lessons videos or did you use another textbook, etc?
2.
Did you also get the additional info (e.g the paper is called the stationery phase) from these videos /textbooks too?
1.
Use ruler to draw horizontal pencil line on chromatography paper (pencil marks insoluble, won’t dissolve in solvent)
2.
Line should be around 2cm from bottom of paper.
3.
Mark pencil spots at equal spaces across the line - leave approx 1cm clear at each side
4.
Use capillary tube to add ink onto the pencil spots.
5.
Pour water into a beaker to a depth of 1cm - below pencil line.
6.
Attach paper to a glass rod using tape and lower paper into beaker (ink not equal to solvent) - bottom of paper should dip into water.
7.
Pencil line with ink must be above surface of water + side of paper must NOT touch side walls of beaker ( it interferes with way water moves)
8.
Put lid on top of beaker to reduce evaporation of the solvent.
9.
Solvent seeps up the paper, carrying ink with it.
10.
Remove paper when water has travelled around 3 quarters up.
11.
Use pencil to mark the solvent front (point where water reached)
12.
Hang paper up-to dry.
13.
If you want to identify chemicals in colours = calculate Rf values.
1.
Use ruler to draw horizontal pencil line on chromatography paper (pencil marks insoluble, won’t dissolve in solvent)
2.
Line should be around 2cm from bottom of paper.
3.
Mark pencil spots at equal spaces across the line - leave approx 1cm clear at each side
4.
Use capillary tube to add ink onto the pencil spots.
5.
Pour water into a beaker to a depth of 1cm - below pencil line.
6.
Attach paper to a glass rod using tape and lower paper into beaker (ink not equal to solvent) - bottom of paper should dip into water.
7.
Pencil line with ink must be above surface of water + side of paper must NOT touch side walls of beaker ( it interferes with way water moves)
8.
Put lid on top of beaker to reduce evaporation of the solvent.
9.
Solvent seeps up the paper, carrying ink with it.
10.
Remove paper when water has travelled around 3 quarters up.
11.
Use pencil to mark the solvent front (point where water reached)
12.
Hang paper up-to dry.
13.
If you want to identify chemicals in colours = calculate Rf values.
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