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Chapter 23: Q26P (page 630)

The retention volume of a solute is 76.1mL for a column withVm=16.6mL andVs=12.7mL . Calculate the retention factor and the partition coefficient for this solute.

Short Answer

Expert verified

a) Retention factor =k =3.59

b) Partition coefficient=k = 4.69

Step by step solution

01

Given Information:

Vr=76.2mL,Vm=16.6mL,Vs=12.7mL

02

To find the Retention factor:

Retention factor as

k=Vr-VmVm

Substitute the given data values are

k=76.2mL-16.6mL16.6mLk=3.59

03

To find the Partition coefficient;

K=k脳VmVs

Substitute the given data values are

K=3.59脳16.6mL12.7mLK=4.69

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Most popular questions from this chapter

Match statements 1鈥�5 with the band broadening terms in the second list.

1. Depends on radius of open tubular column.

2. Not present in an open tubular column.

3. Depends on length and radius of connecting tubing.

4. Increases with diffusion coefficient of solute.

5. Increases with thickness of stationary phase film.

A Multiple paths

B Longitudinal diffusion

Cm Equilibration time in mobile phase

Cs Equilibration time in stationary phase

EC Extra column band broadening

For a given value of [HL]orgin Equation 23-13, over what pH range (how many pH units) will D change from if n = 2?

A solute with partition co-efficient of 4.0 is extracted from 10 mL of phase 1 into phase 2.

(a) What volume of phase 2 is needed to extract 99% of the solute in one extraction?

(b) What is the total volume of solvent 2 needed to remove 99% of the solute in three equal extractions?

23-14 For the extraction of Cu2+by dithizone CCI4,KL=1.1脳104,KM=7脳104,Ka=3脳10-5,b=5脳1022,n=2

(a) Calculate the distribution coefficient for extraction of 0.1mM Cu2+

into CCI4by 0.1mM dithizone at and at pH = 1 and at pH = 4 .

(b) If 100mL of 0.1mM aqueous Cu2+are extracted once with 10mL

of 0.1mM dithizone atpH = 1 , what fraction of Cu2+remains in the aqueous phase?

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.
See all solutions

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