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If the distance from the origin to the middle of a spot is 3.8 cm and...

If the distance from the origin to the middle of a spot is 3.8 cm and the distance from the middle of the same spot to the solvent front is 3.6 cm, what is the Rf for this compound?

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Answer #1

Ans. Given,

I. Distance from origin to the center of spot = 3.8 cm

II. Distance from center of spot of solvent front = 3.6 cm

So,

Total distance between origin and solvent front = 3.8 cm + 3.6 cm = 7.4 cm

So, the distance travelled by solvent front from origin = 7.4 cm

Now,

Rf = Distanced travelled by the spot / Distance travelled by the solvent front

            Or, Rf = 3.8 cm / 7.4 cm

            Hence, Rf = 0.514

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