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-

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.32QAP

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Question

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?

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