A manual of chemistry, inorganic and organic : inorganic and organic, with an introduction to the study of chemistry / by Arthur P. Luff.

  • Luff, Arthur P. (Arthur Pearson), 1855-1938.
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: A manual of chemistry, inorganic and organic : inorganic and organic, with an introduction to the study of chemistry / by Arthur P. Luff. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    over red-hot iron turnings contained in a heated iron pipe; the iron unites with the oxygen of tlie steam to form the black magnetic oxide of iron (FegO^.), and free hydrogen passes on. This constitutes Barff's process for coating articles made of iron with a thin coating of the magnetic oxide of iron, which forms an Fig. 2.—Preparation of Hydrogen from Potassium and Water. extremely hard surface, and effectually prevents any future rusting of the article. Feg + 4H2O = FegO^ + Iron. Water. Magnetic Hydrogen. oxide of iron. (c) By the action of either of the metals potassium or sodium on water at ordinary temperatures. Both these metals are lighter than water, and if either of them be thrown upon water, a violent action takes place, hydrogen being evolved. If the hydrogen is to be collected, it is necessary to wrap the piece of potas- sium or sodium in some wire gauze, which is then lield beneath the water under an inverted jar full of water, within which the hydrogen will then collect (Fig. 2).