Chemical Principles in the Laboratory
Chemical Principles in the Laboratory
11th Edition
ISBN: 9781305264434
Author: Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher: Brooks Cole
Question
Chapter 2, Problem 1ASA
Interpretation Introduction

Interpretation:

The Rf values for the given chromatograph of a mixture are to be stated.

Concept introduction:

Chromatography is the technique used to identify the components of a mixture. The division of the distance covered by the component of a compound to the distance covered by solvent in the chromatography technique is known as the Rf value. The full form of Rf value is retention value.

Expert Solution & Answer
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Answer to Problem 1ASA

The Rf values for the given chromatograph of a mixture which contains compounds A, B, C and D are 0.25, 0.5, 0.75 and 1 respectively.

Explanation of Solution

The chromatograph for a mixture that is prepared by a student is shown below.

Chemical Principles in the Laboratory, Chapter 2, Problem 1ASA , additional homework tip  1

Figure 1

The modified chromatogram with proper divided parts is shown below.

Chemical Principles in the Laboratory, Chapter 2, Problem 1ASA , additional homework tip  2

Figure 2

According to the above shown chromatogram, four compounds A, B, C and D are present in the mixture.

The total distance travelled by the solvent is L.

The total distance travelled by the compound A is L/4.

The total distance travelled by the compound B is L/2.

The total distance travelled by the compound C is 3L/4.

The total distance travelled by the compound D is L.

The expression to represent the Rf value is given below.

Rf=DistancetravelledbythesolutefrombaselineDistancetravelledbythesolvent frombaseline …(1)

To calculate the Rf value for compound A, substitute the value of distance travelled by compound A and distance travelled by solute in equation (1).

Rf=L/4L=14=0.25

To calculate the Rf value for compound B, substitute the value of distance travelled by compound A and distance travelled by solute in equation (1).

Rf=L/2L=12=0.5

To calculate the Rf value for compound C, substitute the value of distance travelled by compound A and distance travelled by solute in equation (1).

Rf=3L/4L=34=0.75

To calculate the Rf value for compound D, substitute the value of distance travelled by compound A and distance travelled by solute in equation (1).

Rf=LL=1

Therefore, the Rf values are 0.25, 0.5, 0.75 and 1.

Conclusion

The Rf values for the given chromatograph of a mixture which contains compounds A, B, C and D are 0.25, 0.5, 0.75 and 1 respectively.

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