Chemical primer; an elementary work for use in high schools, academies, and medical colleges

by S.P. Meads

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 ...orange, Sn S brownish-black, Sn S2 yellow. Hydrogen sulphide (H2S "sulphuretted hydrogen") is much used in the laboratory to precipitate metals, as sulphides. (See Analytical Charts.) H2S is readily inflammable, as may be shown by igniting in test-tube. Note.--Hydrogen sulphide has a slight'acid reaction and was called by the old chemists hydrosulphiiric acid. It unites with many of the bases to form sulphides, and these sulphides might be classed as binary salts. For reasons which need not be explained here, chemists do not no class sulphides in this way, but consider them as analogous to oxides. Carbon disulphide (C S,), a volatile, colorless, inflanw mable liquid, may be produced by passing sulphur over red-hot coals. It is an excellent solvent, dissolving readily S, P, I, and many organjp substances. It refracts light powerfully, and hence is often used in filling prisms. The impure disulphide (its heavy vapor) is used to poison squirrels, insects, etc. The rare element, selenium, in many respects resembles sulphur. We have the compounds H2Se, Se 02, HjSe 04, etc. (See Sulph-And Selex-salts. ) Phosphorus is a semi-transparent, nearly colorless, wax-like solid. It is kept under water in "sticks," as it slowly oxidizes in the air and takes fire at a very low temperature. It is highly poisonous. Its vapor breathed (in more than minute quantities) produces ulceration of the jaw, cured with difficulty. (See Caution, Exp. 24.) Another variety, red or amorphous, is known. This differs widely from ordinary P. It does not emit the "jaw-poisoning fumes" and can be safely handled. P in this "allotropic" state may be prepared by heating ordinary phosphorus in a closed vessel. Part of the P used in making N (exp. 35) is change...

46 pages, Paperback

First published July 1, 2008