Answered: Every spot on a student's TLC plate has…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Every spot on a student's TLC plate has an Rf value from 0.1 to 0.2. The student used a 10% ethyl acetate 920%0% pentane mixture as the eluting solvent. What composition might yield better Rf values for separating the compounds?

		100% pentane
		5% ethyl acetate and 95% pentane
		20% ethyl acetate and 80% pentane

Expert Solution

Step 1

Rf factor means retardation factor is defined as : Rf = Distance travelled by component/Distance travelled by solvent front

Higher is the Rf means compound is traveling more. This means compound is nonpolar in nature.

Lower Rf means the compound is traveling less. This means compound is polar in nature.

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