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Questions 20 and 21 please. The correct answers are circled. Please just explain the theory
proving why the answer is correct and the others are wrong.
Thanks!
20. The correct graph to illustrate the relationship between the carrier gas flow rate and the
height of theoretical plates in a gas chromatographic separation is 21. Experimentally, the plot of
absorbance (A) vs concentration (C) should be 3 of 4
Solution
20 ) C is the answer VANDEEMTER PLOT ( releates flow rate or linear velocity to H ) H = A +
B/mew +C/mew, one use of plate height is to releate this kinetic process band broadening to a
prameter of the chromatographic system ( eg: flow rate )
21 ) A is the answer The linear relationship between concentration and absorbance is both
simple and straightforward, which is why we prefer to express the Beer-Lambert law using
absorbance as a measure of the absorption rather than %T.
the Law is not obeyed at high concentrations. This is deviation from the Law

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Questions 20 and 21 please- The correct answers are circled- Please ju.docx

  • 1. Questions 20 and 21 please. The correct answers are circled. Please just explain the theory proving why the answer is correct and the others are wrong. Thanks! 20. The correct graph to illustrate the relationship between the carrier gas flow rate and the height of theoretical plates in a gas chromatographic separation is 21. Experimentally, the plot of absorbance (A) vs concentration (C) should be 3 of 4 Solution 20 ) C is the answer VANDEEMTER PLOT ( releates flow rate or linear velocity to H ) H = A + B/mew +C/mew, one use of plate height is to releate this kinetic process band broadening to a prameter of the chromatographic system ( eg: flow rate ) 21 ) A is the answer The linear relationship between concentration and absorbance is both simple and straightforward, which is why we prefer to express the Beer-Lambert law using absorbance as a measure of the absorption rather than %T. the Law is not obeyed at high concentrations. This is deviation from the Law