Introduction to the study of inorganic chemistry / by William Allen Miller.

  • Miller, William Allen, 1817-1870.
Date:
1871
Catalogue details

Licence: Public Domain Mark

Credit: Introduction to the study of inorganic chemistry / by William Allen Miller. Source: Wellcome Collection.

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    '■> 1 Oxygen—Mode of Preparing. of oxygen, into a reddish-brown oxide of manganese: 261 grams of pure black oxide would yield 32 grams of oxygen, or 2 2’4 litres of gas. lilack Oxide 3Mn O, 3(55 + 16 X 2) 261 261 Red Oxide Oxygen M113 O4 + O2 55 X3-1- 16x4 n \ X 0 229 32 Exp. 10.—Procure a gaspijjc or an iron tube 3 or 4 centim. in diameter, 40 or 50 cm. long, closed at one end, and provided at the other with a cork, through which is passed a long piece of ]iewtcr or copper tubing ; place 50 or 100 grams of the oxide in small lumps in the tube, and make the closed end of the iron tube red hot : gas will be driven off, and may be collected over water. Red lead, nitre, and several other substances, also give oft' oxygen, more or less pure, when heated ; but either potassic chlorate, or manganese oxide, or the mixture of both, is the substance from which it is usually and most easily obtained. Oxygen is a clear, transparent, colourless gas, which has ne\ er been liquefied by cold or pressure; it has no smell or taste. No other gas can be used instead of o.xygen for the support of respiration in man and animals; but it cannot be saRly breathed in a pure state for any length of time, as it would over-excite the bodily frame. The nitrogen with which it is mi.xcd in the air is needed to dilute it, so that it may be respired with safety. Oxygen is attracted by a magnet like iron. Oxygen is remarkable for its great chemical activity. It will combine with each of the elementary bodies, with the single excejition of Huorine. Substances which will burn in air burn in oxygen with much greater energy, as may be further shown by the following experiments :— ].]xp. 11.—Fasten a piece of barky charcoal to a stout wire ; I'ass the wire through a small flat board or a piece of tinplate. Kindle the charcoal by holding it in a flame; then hang it in a