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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

(a) Why is it difficult to extract the complex of aluminum into an organic solvent but easy to extract the complex?

(b) If you need to bring the EDTAcomplex into the organic solvent, should you add a phase transfer agent with a hydrophobic cation or a hydrophobic anion?

23-41. Describe how nonlinear partition isotherms lead to non-Gaussian band shapes. Draw the chromatographic peak shapes produced by an overloaded gas chromatography column and an overloaded liquid chromatography column.

(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.

Match statements 1–5 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?
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