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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

of 3

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

02

of 3

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

of 3

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

The retention volume of a solute is 76.2mL for a column withVm=16.6mL andVs=12.7mL . Calculate the retention factor and the partition coefficient for this solute.

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

A Gas chromatogram of a mixture of toluene and ethyl acetate is shown here:

(a)Use the width of each peak (measured at the base)to calculate the number of theoretical plates in the column. Estimate all lengths to the nearest 0.1 mm.

(b)Using the width of the toluene peak at its base, calculate the width expected at half height. Compare the measured and calculated values. When the thickness of the the line is significant relative to the length being measured, it is important to take the pen line width into account. You can measure from the edge of one line to the corresponding edge of the other line,as shown here.

(a) For the asymmetric chromatogram in Figure 23-14, calculate the asymmetry factor, BA.(b) The asymmetric chromatogram in Figure 23-14 has a retention time equal to 15.0 min and a w0.1of 44s . Find the number of theoretical plates. (c) The width of a Gaussian peak at a height equal to110 of the peak height is 4.297蟽. Suppose that the peak in (b) is symmetric with A=B=22s. Use Equations 23-30 and 23-32 to find the plate number.

Two compounds with partition coefficients of 15 and 18 are to be

separated on a column with Vmi/Vs=3.0and localid="1654950413291" tm=1.0min. Calculate the

number of theoretical plates needed to produce a resolution of 1.5 .
See all solutions

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