Chapter 23: Q36P (page 631)
Why is longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography?
The solution is
longitudinal diffusion in gas chromatography would be substantially faster than in liquid chromatography.
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
In chromatography, resolution is governed by (a) the number of plates, (b) relative retention, and (c) retention factor. Construct a set of graphs to show the dependence of resolution on each of these three parameters. Comment on the nature of the dependence of resolution on each of these three parameters.
23-38. What is the optimal flow rate in Figure 23-17 for best separation of solutes?
The retention volume of a solute is 76.1mL for a column with and . Calculate the retention factor and the partition coefficient for this solute.
23-42. A separation of of an unknown mixture has been optimized on a column of length L and diameter d .
(a) Explain why you might not achieve the same resolution if the of unknown mixture were injected in twice the injection volume.
(b) Explain why you might not achieve the same resolution if of unknown mixture were injected in the original injection volume.
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.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
