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Chapter 23: Q23P (page 630)

Solvent passes through a column in 3minbut solute requires9min (a) Calculate the retention factor,k.(b) What fraction of time is the solute in the mobile phase in the column? (c) The volume of stationary phase is110of the volume of the mobile phase in the columnVS=0.10VM. Find the partition coefficient, K, for this system.

Short Answer

Expert verified

a)k=2b)fraction=0.33c)K=20

Step by step solution

01

Given Information:

tr=9min,tm=3min,VS=0.10Vm

02

To find the Retention factor:

Retention factor can be expressed as

k=tr-tmtm

Substitute the given values are

k=9min-3min3mink=2

03

To find the fraction of time of the solute in the mobile phase:

fraction=tmtrfraction=3min9minfraction=0.33

04

To find the Partition coefficient in the stationary phase:

K=k×VmVsK=2×Vm0.10VmK=2×Vm0.10VmK=2×10.10K=20

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Most popular questions from this chapter

In chromatography, resolution is governed by (a) the number of plates, (b) relative retention, and (c) retention factor. Construct a set of graphs to show the dependence of resolution on each of these three parameters. Comment on the nature of the dependence of resolution on each of these three parameters.

Consider the extraction of 100mLofM+2by2mLof1×10-5MdithizoneinCHCl3for which KL=1.1×104,KM=7×1024,Ka=3×10-5,β=5×1018,n=2(a) Derive an expression for the fraction of metal ion extracted into the organic phase, in terms of the distribution coefficient and volumes of the two phases. (b) Prepare a graph of the percentage of metal ion extracted over the pH range 0 to 5.

A Gas chromatogram of a mixture of toluene and ethyl acetate is shown here:

(a)Use the width of each peak (measured at the base)to calculate the number of theoretical plates in the column. Estimate all lengths to the nearest 0.1 mm.

(b)Using the width of the toluene peak at its base, calculate the width expected at half height. Compare the measured and calculated values. When the thickness of the the line is significant relative to the length being measured, it is important to take the pen line width into account. You can measure from the edge of one line to the corresponding edge of the other line,as shown here.

The solute in Problem 23 - 8 is initially dissolved in 80.0 mL of water. It is then extracted six times with 10.0mL portions of chloroform. Find the fraction of solute remaining in the aqueous phase.

Why does plate height depend on linear velocity, not volume flow rate?
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