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Chapter 23: Q40P (page 631)

Explain how slinization reduces tailing of chromatographic peaks.

Short Answer

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Silanization creates hydroxyl groups that can form strong hydrogen bonds.

Step by step solution

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We will explain how slinization can reduce chromatographic peak tailing in this task.

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- the process of applying alkoxysilane molecules to a surface.

- By blocking the silanol groups with nonpolar trimethylsilyl groups, this technique reduces tailing.

- It's called end-capping because silanization can cap hydroxyl groups that can create strong hydrogen bonds, which reduces chromatographic peak tailing.

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Most popular questions from this chapter

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

Butanoic acid has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the formal concentration of butanoic acid in each phase when 100mL of 0.10M aqueous butanoic acid is extracted with 25mL of benzene (a) at pH 4.00 and (b) at pH 10.00.

For the separation of A and B by column 2 in Problem 23-32:

(a) If broadening is mainly due to longitudinal diffusion, how should the flow rate be changed to improve the resolution?

(b) If broadening is mainly due to the finite equilibrium time, how should the flow rate be changed to improve the resolution?

(c) If broadening is mainly due to multiple flow paths, what effect will flow rate have on the resolution?

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?

Solvent passes through a column in 3minbut solute requires9min (a) Calculate the retention factor,k.(b) What fraction of time is the solute in the mobile phase in the column? (c) The volume of stationary phase is110of the volume of the mobile phase in the columnVS=0.10VM. Find the partition coefficient, K, for this system.
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