Date: Chemistry Lab 111 Paper Chromatography Experiment: Separation of Indicator

Question

Date: Chemistry Lab 111 Paper Chromatography Experiment: Separation of Indicator Mixtures Name: Fredhhnar Partner's Name: Pre Lab Questions: 1) By definition, what is the Rr (Retention the distance ioredby d (opdand to the d'u tance movej by the Solvent Fan 2) Based on the Rr definition, what does an Rr of zero mean? 3) Based on the Rr definition, what does an Rr of I mean? 4) If a spot moves right along with the solvent front, what is its R? Is this the largest Rr value possible? Why? 5) If one component in a mixture travelled 9.6 cm from the spotting origin, while the solvent travelled 12.0 cm, what is its Rr value? General Chemistry Lab- Paper Chromatography Revised- Heidary & Allara-1/2018

Explanation / Answer

1.

Rf = retardation factor

Rf is the ratio of distance travelled by spot to the distance travelled by solvent front.

Rf = distance travelled by spot / distance travelled by solvent front

2.

Rf = 0 means the spot does not travelled from the referance line

3.

Rf = 1 means spot and solvent front are travelled equal distance.

4.

5.

distance travelled by one component = 9.6 cm

distance travelled by solvent front = 12.0 cm

Rf = 9.6 / 12.0

Rf = 0.80

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