A student used paper chromatography to separate two components, I and II, in a solution - VCE - SSCE Chemistry - Question 6 - 2006 - Paper 1
Question 6
A student used paper chromatography to separate two components, I and II, in a solution. A spot of the solution was initially placed at the origin.
When the spot co... show full transcript
Worked Solution & Example Answer:A student used paper chromatography to separate two components, I and II, in a solution - VCE - SSCE Chemistry - Question 6 - 2006 - Paper 1
Step 1
Calculate the distance travelled by component II
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Answer
The distance travelled by component I is 4.0 cm. Since component II is 1.0 cm behind, its distance travelled is:
4.0extcm−1.0extcm=3.0extcm
Step 2
Calculate the $R_f$ value of component II
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Answer
The Rf value is calculated by the formula:
R_f = rac{ ext{Distance travelled by the component}}{ ext{Distance travelled by the solvent front}}
In this case, the solvent front distance is 4.0 cm (distance travelled by component I), so:
R_f = rac{3.0 ext{ cm}}{4.0 ext{ cm}} = 0.75
Step 3
Select the closest option
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Answer
The computed Rf value for component II is 0.75, which is closest to the option B. Thus, the correct answer is:
