Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

In gas chromatography the mobile phase is an inert gas such as N2 or He. A mixture’s components must be volatile if they are to move in the mobile phase. As with liquid chromatography, the separation is based upon forces of attraction of the various sample components with the mobile and the stationary phases; greater attractive forces between a compound and the column will result in a longer elution time. Assume that you want to separate a group of hydrocarbons, such as pentane (C5H12), hexane (C6H14), heptane (C7H16), and octane (C8H18) using a column with a nonpolar stationary phase. Predict the order of elution of these species from the column and explain your answer.

Interpretation Introduction


To identify the elution order of given alkanes in the statement.

Concept Introduction:

London dispersion force also called an induced dipole-induced dipole attraction is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.

Dipole-dipole interaction results when two dipolar molecules interact with each other through space, there occurs a partially negative charge of one of the polar molecules is attracted to the partially positive charge of the second polar molecule.

Ion-dipole interaction results of an electrostatic interaction between a charged ion and a molecule that has a dipole.

A hydrogen bonding is partially an electrostatic attraction between H atom which is bonded to more electronegative atom such as N, O, orF and another adjacent atom bearing a lone pair of electron.

  • HPLC injects a sample into a mobile (liquid) phase, which is then passed through a column containing the stationary (solid) phase.
  • The liquid phase is your solvent and the medium in which your sample travels.
  • The order of elution from the first to last end as shown, pentane

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