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Unit 5-workboof Snd Improtsnt
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Total cards: 4•Content version: v4•Public deck•Updated: 8/1/2026
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#1
Front (Question)
Chromatography-why should original line be drawn in pencil?
Back (Answer)
-ink from pen would dissolve in solvent and run up the chromatography paper
#2
Front (Question)
Why should the solvent front be drawn immediately?
Back (Answer)
-solvent evaporates rapidly so end position may not be so visible after a while.
#3
Front (Question)
Why would we measure rf value from middle of pigment line?
Back (Answer)
-pigment mark is spread out -measuring middle position, standardised measurement -allows for fair comparison
#4
Front (Question)
Why should chromatography paper be vertical and straight?
Back (Answer)
So pigments move straight up and avoid them running to side