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Chapter 23: Q34P (page 631)

Why does plate height depend on linear velocity, not volume flow rate?

Short Answer

Expert verified

The solution is

the longitudinal diffusion (Bux) is inversely proportional to the duration the solute spends on the column (ux).

Step by step solution

01

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We'll explain why plate height is affected by linear velocity but not by volume flow rate in this work.

02

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Volume flow rate

- for example,1mLmin ; indicates how many mL of solvent pass through the column per minute.

Flow rate that is linear.

- For example,1cmmin tells us how many cm the solvent travels per minute.

03

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As a result, linear flow rate defines how complete the two-phase equilibrium is:

- the van Deemter equation is used to calculate the value of equilibration time (mass transfer).

- furthermore, the longitudinal diffusion (Bux)is inversely proportional to the duration the solute spends on the column (ux).

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Most popular questions from this chapter

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?

(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?

23-1.If you are extracting a substance from water into ether, is it more effective to do one extraction with of ether or three extractions with ?

Which column is more efficient: plate height = 0.1 mm or plate height = 1 mm?

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.
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