Keys to Problem Set 2 - CHM 614/714 Answer Key to Problem...

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1 CHM 614/714 Answer Key to Problem Set #2 1. (a) For column flow resistance, , both d p and P should be small, column length (L) and flow velocity ( ) should be large, so f decreases with increasing column "quality". Column impedance should also decrease with increasing column quality. Lower reduced plate heights are best, as are column flow resistance values. (b) We first need the mobile phase flow velocity F r 2 T 1 . 55 cm 3 60 sec ( 3 . 14) ( 0 . 23 cm ) 2 ( 0 . 49) 0 . 32 cm / sec ( 5 10 4 cm ) 2 ( 2250 psi ) ( 68, 947 . 6 dyne sec / cm 2 psi ) ( 25 cm ) ( 0 . 0101 dyne sec cm 2 ) ( 0 . 32 cm / sec ) 480 (c) An efficient chromatographic system gives h from 2 to 5. The lowest value: E h 2 ( 2 ) 2 ( 600 ) 2400 The highest value: E h 2 ( 5 ) 2 ( 900 ) 22, 500 2. (a) The most important factors are: (1) Maximum operating temperature (higher is better). (2) Minimum operating temperature (lower is better). (3) Polarity of the stationary phase (to separate solutes by interaction of particular functional groups).
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