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The only differences are that it uses a moving gas phase and a stationary liquid phase, and that the temperature of the gas system can be controlled. In a gas chromatograph the sample is shot in with a syringe and is immediately vaporized in a heated injection chamber. It is then introduced to a moving stream of gas called the carrier gas which sweeps the vaporized sample into a column filled with particles filled with liquid adsorbent. This column is usually filled with liquid that has a low vapor pressure and high boiling and is called the stationary phase.

This phase is also usually coated onto support material very evenly and packed into a tubing apparatus as evenly as possible and placed in the temperature controlled oven. When organic solutions are passed through the tubing van deer Walls forces attract the monopole molecules especially if they have large molecular weights. Polar molecules can be attracted in many ways. Interactions include salt formation, coordination, hydrogen bonding, and even dipole-dipole. Through these interactions the molecules in the vaporized sample will separate accordingly.

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If one peak was found then that substance is 100% pure. If more then one peak is found the area of the peak representing the component is found and divided by the total area of all of the peaks together. Multiplied by 100 and this is the percentage of the material in the sample. Caraway oil had only one peak so it was 100% pure, whereas Spearmint oil had two peaks and was found to be 59% carven. The optical activity of the S-carven and R-carven were found sing a formula in the calculations section.

When the optical activity of two choral molecules is different they are called moisteners, that is that the molecule’s structure is the same except that a few atoms are bent in different positions via the choral center. Because the 2 cartoons are of the same physical properties but have different optical rotation, they are moisteners. All errors in this lab that could have occurred must be do to calculation or machine fault, due to the fact that no experiment was actually done. Samples were merely tested in a GO machine and calculations were made.

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