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Chapter 23: Q24P (page 630)

Solvent occupies15% of the volume of a chromatography column whose inner diameter is 3mm. If the volume flow rate is 0.2mL / min, find the linear velocity.

Short Answer

Expert verified

Linear velocity isux=18.87cm/min

Step by step solution

01

Given Information:

Vsolvent=0.15Vcolumn,d=3mm=0.3cm,r=d/2=0.15cm,uV=0.2mL/min

02

To find the volume of solvent:Volume of solvent can be expressed as per length of a column as

Vsolvent/cm=0.15VcolumnVsolvent/cm=0.15脳蟺谤2IAslengthI=1cmVsolvent/cm=0.15脳(蟺脳0.15cm2脳1cmVsolvent/cm=0.0106cm3Vsolvent/cm=0.0106mLVsolvent/cm=0.0106mL/1cm

03

To find the linear velocity:

ux=uVVsolvent/cmux=0.2mL/min0.0106mL/cmux=18.87cm/min

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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

23-38. What is the optimal flow rate in Figure 23-17 for best separation of solutes?

Which of the following columns will provide:

(a) highest number of plates?

(b) greatest retention?

(c) highest relative retention?

(d) best separation?

Column1:N=1000;k2=3.9;伪=1.16;resolution=0.6Column2:N=5000;k2=3.9;伪=1.06;resolution=0.8Column3:N=500;k2=4.7;伪=1.31;resolution=1.1Column4:N=2000;k2=2.4;伪=1.24;resolution=1.5

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?

An open tubular column is 30.01 mlong and has an inner diameter of 0.530mm. It is coated on the inside wall with a layer of stationary phase that is3.1渭尘thick. Unretained solute passes through in 2.16min, whereas a particular solute has a retention time of 17.32min. (a) Find the linear velocity and volume flow rate. (b) Find the retention factor for the solute and the fraction of time spent in the stationary phase.(c) Find the partition coefficient, K 5 cs/cm, for this solute.
See all solutions

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