3) Calculate the Rf value if the distance traveled by spot is given as 0 012em a

Question

3) Calculate the Rf value if the distance traveled by spot is given as 0 012em and the distano traveled by solvent front is given as 9em (Spts) 4) In an experiment to determine the freezing point of pure naphthalene, a student heated pure naphthalene up to approximately 100 C in a test tube using a water bath and observed its temperature as it cooled to approximately 65°C (a) Prepare a cooling curve the x-axis (15pts) aurve by plottig temperature along the y-avis versus time in seconds along Time (sec) Temperature (C) 30 60 90 97.5 93.0 89.0 85.5 84.5 82.0 81.5 81.0 80.5 80.0 80.0 80.0 80.0 120 150 180 210 240 270 300 330 360 390 420 450 480 79.5 78.0 76.5 Continued)

Explanation / Answer

3) Given,

Distance travelled by the spot = 0.012 cm

Distance travelled by the solvent = 9 cm

Retention factor(Rf) of a particular material is the ratio of distance the spot moved above the origin to the distance the solvent front moved above the origin.

Retention factor(Rf) = 0.012cm / 9 cm = 1.33 x 10-3

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