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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    in appearance ; and tungsten in a heavy, black, hard mineral, called luolfrani. It is unnecessary to describe further the compounds of molybdenum and tungsten, or those of colum- l)iuni, tantalum, and vanadium ; for particulars respecting them the reader is referred to systematic treatises on Chemistry. CH.\PTER XV. I. .\RSEXICUM. 2. ANTIMOXV. 3. BISMUTH. (57) 1. Arsexmcum : Symb. As; Atom. IFt. 75; S/. gr. of solid, 5'95 ; of vapour, io'6 ; Atom. ]’ol. i, or [] , Mol. Vol. I ; ; ; I, As^; Jici. Jl't. 150. This highly poisonous substance e.xhibits characters inter- mediate between those of the non-metals and the metals. It conducts electricity in a moderate degree, and possesses high metallic brilliancy ; but it much resembles phosphorus in general ])roperties, including its anomalous vapour density. It is usually found in the form of an alloy with some other metal, especially with iron, cobalt, nickel, or cojjper. Now and then it is found native, and occasionally in the form of a metallic arseniate. In the i)re]jaration of the metal native arsenide of iron or of cobalt is roasted, or lieated in a current of air. The arsenicum becomes o.xidized, and forms arsenious anhydride (.Vsdlj), or white arsenic, which is volatilised below a red heat, and becomes condensed again as it cools in the Hues, or in chambers constructed to receive it. In order to obtain the metal, this white oxide is powtlered, mixed with charcoal, and heated in a crucil)le, upon the toj) of which a second inverted crucible is luted ; and this is screened from the fire by means of a ])crforated iron plate. Carbonic oxide is formed, and escapes, while the metal, which is also volatile below redness, sublimes, and is con- densed in the cool inverted crucible. The metal, however.