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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×πr2IAslengthI=1cmVsolvent/cm=0.15×(π×0.15cm2×1cmVsolvent/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

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?

Find the retention factors for octane and nonane in figure 23-7. What you measure distances , estimate them to the nearest 0.1mm.

(b) Find the ratiotimeoctanespendsinstationaryphasetoatltimeoctanespendsoncolumn

(c) Find the Relative retention for octane and nonane.

(d) Find the partition coefficient for Octane by assuming that the volume of the stationary phase equals half the volume of the mobile phase.

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

When performing liquid-liquid extraction, it is common practice to shake the separatory funnel to disperse one phase into the other.

(a) Does shaking the separatory funnel change the partition coefficient?

(b) Explain the purpose of shaking the funnel.

23-32. Chromatograms of compounds A and B were obtained at the same flow rate with two columns of equal length. The value of tmis 1.3m in both cases.


(a) Which column has more theoretical plates?

(b) Which column has a larger plate height?

(c) Which column gives higher resolution?

(d) Which column gives a greater relative retention?

(e) Which compound has a higher retention factor?

(f) Which compound has a greater partition coefficient?

(g) What is the numerical value of the retention factor of peak A?

(h) What is the numerical value of the retention factor of peak B?

(i) What is the numerical value of the relative retention?
See all solutions

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