Organic 2 Review Problem 488

Organic 2 Review Problem 488 - 4 72 PRACTICAL O RGANIC C...

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472 PRACTICAL ORGANIC CHEMISTRY nated rubber pressure tubing over a glass-to-glass joint. The side-arm 1 (Fig. 86) of the carbon dioxide absorption tube is attached by a similar joint to a small guard-tube V containing perchlorate to prevent any water vapour reach- ing the perchlorate in the absorption tube. This end of the absorption train is supported by a small wire hook attached to a stand. The Mariotte bottle. The perchlorate guard tube is attached by a length of ordinary rubber condenser tubing to the Mariotte bottle W. This is, in effect, a siphon bottle, and the lead-in tube X is a capillary provided with a tap T 1 . The bent capillary Y (drawn off slightly at the end) serves as exit tube; it is fitted into W by a rubber bung and its level may be adjusted. By the time the oxygen stream has reached the absorption tubes its initial excess pressure (ca. 6 cm. of water) has been almost completely dissipated by the resistance afforded to its passage by the packing of the combustion tube. The
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