Organic 2 Review Problem 24

Organic 2 Review Problem 24 - 8 P RACTICAL O RGANIC C...

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8 PRACTICAL ORGANIC CHEMISTRY may be collected directly into a suitable flask D, but the use of an adaptor in this way is seldom necessary. The liquid is then placed in the flask A (which should not be more than three- fifths filled), some small fragments of unglazed porcelain* added, the thermometer E placed in position, and the flask then heated—either on a water-bath if the liquid has a low boiling-point, or else on a sand-bath, or directly over a wire gauze. The following important points with regard to simple distillation should be noted:— (i) The fragments of unglazed porcelain* should always be added whenever a liquid is boiled, in order to provide nuclei for the formation of bubbles of the vapour, and thus ensure steady, gentle FIG. 2. boiling. If the por- celain is omitted, the liquid may become superheated, and then suddenly boil with great violence. Fires are often caused by students omitting this precaution when distilling inflammable solvents, which then "bump" so violently that the liquid either pushes the thermo-
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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