A short text-book of inorganic chemistry / by Hermann Kolbe ; translated and edited by T.S. Humpidge.

  • Kolbe, Hermann, 1818-1884.
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: A short text-book of inorganic chemistry / by Hermann Kolbe ; translated and edited by T.S. Humpidge. Source: Wellcome Collection.

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    side is another tube with the stop-cock e, which allows the gas contained in B to flow out when required. The vessel B is first filled with water by pouring it into A, and opening the cocks, a, b, and e. The water flows in by the tube a, reaching nearly to the bottom of B, and displaces the air, which escapes by the tubes b and e, until the entire vessel is full. After all the stop-cocks have again been closed, the lower, wider tube d inay be opened without water flowing out. The end of the tube, front the apparatus evolving the gas, is then inserted at d, and as the gas enters the vessel B it displaces the water which flows out by the side of the tube front d. The exter.t to which the gasonieter is filled with gas is shotvn by the height of the coluntn of water in the glass tube g, /, which communicates with the interior of the vessel B, above and below, and in which the water is always as high as in the interior of the gasonieter. When the gasonieter is filled as far as required, the tube is withdrawn, the screw at d replaced, and the stop-cock a opened. The gas enclosed in B is tlius subjected to a pressure equal to the coluntn of water front the surface of the water in B to that in A. If the stop-cocks and joints of the gascmeter are air-tight, the gas may be preserved in it for a long time. When a regulär streant of gas is required, the tube e is connected with the apparatus by a piece of india-rubber tubing, and the stop-cock opened. If the gas is to be collected in a cylinder over water, the cylinder is filled with water, closed with a glass plate, and inverted in the water of the vessel A. The glass plate is then rentoved, and the stop-cock b opened, when the gas rises, the cock a being open, uttder the pres- sure of the difference between the coluntn of water in and over the tube a and of that over the opening of b in the cylinder. HYDROGEN. Chemical Symbol'. H.—Atomic IVeight: i. Unlike oxygen, hydrogen does not occur in the free state in the earth’s atmosphere, but recent physical investigations have shown that it is contained in the atmosphere of sonte of the heavenly