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Homework solutions for chem 422 chapter 26 10 there

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Unformatted text preview: for Chem 422 Chapter 26 10. There is a minimum in a plot of plate height versus flow rate because band broadening due to longitudinal diffusion effects decreases with increasing flow rate while broadening due to mobile-phase and stationary-phase mass-transfer effects increases with increasing flow rate. Since longitudinal diffusion is much less a factor in liquid chromatography, the minimum plate height is found at a much lower flow rate than for gas chromatography. 11. Gradient elution is a method used in liquid chromatography in which the composition of the mobile phase is changed continuously or in steps in order to improve separations. 12. The variables that...
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