
(a)
Interpretation:
Whether higher or lower percentage of acetonitrile should be used in the next run has to be explained.
Concept Introduction:
In reversed phase chromatography, stationary phase is less polar than the mobile phase. So, the stationary phase will retain the non-polar component more tightly and polar component will be eluted first. Hence to increase the resolution of the peaks, the polarity of mobile phase should be increased.
(b)
Interpretation:
Whether higher or lower percentage of hexane should be used in the next run has to be explained.
Concept Introduction:
In normal phase chromatography, stationary phase is more polar than the mobile phase. So, the stationary phase will retain the polar component more tightly and non-polar component will be eluted first. Hence to increase the resolution of the peaks, the polarity of mobile phase should be decreased.

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Chapter 22 Solutions
EBK EXPLORING CHEMICAL ANALYSIS
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