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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脳VmVsK=2脳Vm0.10VmK=2脳Vm0.10VmK=2脳10.10K=20

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Most popular questions from this chapter

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.

Butanoic acid has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the formal concentration of butanoic acid in each phase when 100mL of 0.10M aqueous butanoic acid is extracted with 25mL of benzene (a) at pH 4.00 and (b) at pH 10.00.

Consider a chromatography experiment in which two components with retention factors k1=4.00and k2=5.00are injected into column with N=1.00脳103theoretical plates. The retention time for the less-retained component is tr1=10.0min.

(a)Calculate tmandt12.Find w12(width at half height) and w (at the base) for each peak.

(b)Using graph paper , sketch the chromatogram analogous to figure 23-7,supposing that two peaks have same amplitude(height). Draw the half widths accurately.

(c)Calculate the resolution of the two peaks and compare this value with those drawn in Figure 23-10.

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.

(a) A chromatography column with a length of 10.3 cmand inner diameter of 4.61mmis packed with a stationary phase that occupies 61.0% of the volume. If the volume flow rate is 1.13mL, find the linear velocity in cm/min.(b) How long does it take for solvent (which is the same as unretained solute) to pass through the column? (c) Find the retention time for a solute with a retention factor of 10.
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