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Chapter 23: Q39P (page 631)

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

Short Answer

Expert verified

The solution is

1.Cm ,

2. A,

3. E C,

4. B,

5 .Cs

Step by step solution

01

of 3

We'll match assertions 1-5 to the band broadening phrases in the second list in this task.

First 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.

02

of 3

Second list

A Multiple paths

B longitudinal diffusion

CmEquilibration time in mobile phase

CsEquilibration time in stationary phase

CsExtra column band broadening

03

of 3

The final solution is

1.Cm ,

2. A,

3. E C,

4. B,

5 .Cs

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Most popular questions from this chapter

(a) Explain why the diffusion coefficient of CH3OHis greater than that of

sucrose in Table 23-1.

(b) Make an order-of-magnitude estimate of the diffusion coefficient of water

vapor in air at 298K.

Isotopic compounds (isotopologues) are separated in Figure 23-15 by repeated passage through a pair of columns. Each cycle in the figure represents

one pass through length L = 25 cm containing

L theoretical plates. The relative retention (α) is and the retention factor for

L-phenylalanine is k2=1.62. (a) The observed resolution after 10 cycles is 1.60 .

Calculate the number of theoretical plates, N , in column length L . The mixture

has passed through length 10L in 10 cycles.

(b) Find the plate height in μm.

(c) Predict the resolution expected from two cycles. The observed value is 0.71 .

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?

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.

(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 4.297σ. Suppose that the peak in (b) is symmetric with A=B=22s. Use Equations 23-30 and 23-32 to find the plate number.
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