A student sets up a paper chromatogram and places a spot of purple food dye on the origin.
After six minutes the solvent has moved 15 cm and a red spot has advanced 12 cm.
After fifteen minutes the solvent has advanced a further 7.5 cm.
How far from the origin is the red spot likely to be after fifteen minutes?
(Give units with your answer)
Hint: you may first want to calculate the Rf value.
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Answer:
x = 15
Explanation:
For a particular solvent Rf value remains constant
rf = total distance travelled by the spot /total distance travelled by the solvent front
rf = x/20
9/12 = x/20
⇒x=15cm
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Answer:
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