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From distribution studies, species M and N are known to have water/hexane distribution constants of 5.99 and 6.16 (K = [X]H,O/[X] hex), where X = M or N. The two species are to be separated by elution with hexane in column packed with silica gel contain-

From distribution studies, species M and N are known to have water/hexane distribution constants of 5.99 and 6.16 (K = [X]H,O/[X] hex), where X = M or N. The two species are to be separated by elution with hexane in column packed with silica gel contain-

Chemistry
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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From the data calculate:

 

a) retention factor of each solute

b) selectivity factor

c) how many plates are needed to provide a resolution of 1.5?

d)how long a column is needed if the plate height of the packing is 1.5x10^-3cm?

e)if the flow rate is 6.75 cm/min how long will it take to elite the two species? 

*31-32. From distribution studies, species M and N are known to have water/hexane distribution constants of 5.99 and 6.16 (K = [X]H,0/[X]hex), where X = M or N. The two species are to be separated by elution with hexane in a column packed with silica gel contain- ing adsorbed water. The ratio Vs/VM for the packing is 0.425. (a) Calculate the retention factor for each solute. (b) Calculate the selectivity factor. (c) How many plates are needed to provide a resolu- tion of 1.5? (d) How long a column is needed if the plate height of the packing is 1.5 X 10-³ cm? (e) If the flow rate is 6.75 cm/min, how long will it take to elute the two species?
Transcribed Image Text:*31-32. From distribution studies, species M and N are known to have water/hexane distribution constants of 5.99 and 6.16 (K = [X]H,0/[X]hex), where X = M or N. The two species are to be separated by elution with hexane in a column packed with silica gel contain- ing adsorbed water. The ratio Vs/VM for the packing is 0.425. (a) Calculate the retention factor for each solute. (b) Calculate the selectivity factor. (c) How many plates are needed to provide a resolu- tion of 1.5? (d) How long a column is needed if the plate height of the packing is 1.5 X 10-³ cm? (e) If the flow rate is 6.75 cm/min, how long will it take to elute the two species?
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