Theoretical organic chemistry / by Julius B. Cohen.

  • Julius B. Cohen
Date:
1928
Catalogue details

Licence: In copyright

Credit: Theoretical organic chemistry / by Julius B. Cohen. Source: Wellcome Collection.

    40/632 page 20
    The original form of the apparatus was devised by Liebig (1831). A hard glass tube is filled two-thirds full of coarse copper oxide, a small boat containing a weighed quantity of the substance is then introduced, and behind it a roll of oxidised copper gauze, as shown in Fig. n. The tube is placed in a combustion furnace and the end nearest 5cm CuO 5cm -—p. <---.-> BOAT spiral «- asbestos asbestos Fig. 1 i.—Arrangement of tube for the estimation of carbon and hydrogen. to the boat is connected with two gas-holders, one containing oxygen and the other air. The gases are purified by passing them through U-tubes containing soda-lime and concentrated sulphuric acid. The other end of the tube is attached to a weighed U-tube containing calcium chloride (Fig. 12), and an apparatus, two forms of which are shown in Figs. 13 and 14, containing a strong solution Fig. 12.—Calcium chloride tube. of caustic potash, which is also weighed. The arrangement of the whole apparatus is shown in Fig. 15. The layer of copper oxide is made red-hot, and then the roll of copper gauze, whilst a slow current of oxygen from the gas-holder is passed through the tube. The substance is then gradually heated and burnt.1 The water, which is formed, collects in the 1 The full details of the process are described in the Author's Practical Organic Chemistry (Macmillan).
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