Outlines of chemistry for the use of students

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H. W. Derby & Company, 1851 - 614 pages
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Page 111 - The water becomes gradually charged with oil of vitriol, and the deutoxide of nitrogen, being reconverted into nitrous acid by contact with the oxygen of the air, again yields half its oxygen to a fresh portion of sulphurous acid ; and thus, for an indefinite period, acts as a carrier of oxygen from the air to the sulphurous acid. In this way, a comparatively small quantity of nitrate is required for a large quantity of sulphur.
Page 436 - ... acid in water, which is drawn off and dried up after being washed with ether. The dry mass is redissolved in water, and again dried up in vacuo. Tannic acid thus obtained is nearly white, and not at all crystalline. It is very soluble in water and has a most astringent taste without bitterness. It is soluble in weak alcohol, but hardly soluble in ether. The aqueous solution, if exposed to the air, absorbs oxygen, produces an equal volume of carbonic acid, and is converted into gallic and ellagic...
Page 38 - The equivalent of a compound body is the sum of the equivalents of its elements. Thus the equivalent of...
Page 122 - ... acid by means of sulphite of ammonia and hydrochloric acid. When precipitated, selenium appears as a red powder, which, when heated, melts, and on cooling forms a brittle mass, nearly black, but transmitting red light in thin plates. When more strongly heated it volatilises, yielding a yellow gas, which condenses into a crystalline dark red powder on a cold surface.
Page 69 - It has, therefore, been described minutely, and will hereafter be referred to in describing the preparation of the above gases.) Properties. — Hydrogen is a gas, colorless, tasteless, and, when quite pure, devoid of smell. When prepared from common zinc or iron, it contains some foreign body, which gives it an unpleasant smell. It is the lightest body known, its Sp. G. being 0.0694 (air=1), or 16 times less than that of oxygen.
Page 526 - ... as in that of cinnamon; and in pulpy fruits, such as the apple, Finally, it is contained in the expressed juice of most vegetables, such as the carrot, in a state of suspension, being deposited on standing. The starch of commerce is chiefly extracted from wheat flour and potatoes.
Page 75 - ... calcareous, and chalybeate), sulphatic waters (containing chiefly sulphates), chlorinated waters (containing chiefly chlorides), and sulphuretted waters (containing large quantities of sulphides or of sulphuretted hydrogen). The only way to obtain perfectly pure water is to distil it, but matter simply held in suspension may be got rid of by suitable filtration. The great reservoirs of water on the globe are the oceans, seas, and lakes, which cover more than three-fifths of its surface, and from...
Page 386 - Thialdine is almost insoluble in water, but very soluble in alcohol and ether. It is deposited, by spontaneous evaporation, from its ethereal solution, in large and beautiful erystals, resembling camphor.
Page 518 - C12H5N04, and may be viewed as benzol, in which 1 eq. of hydrogen is replaced by 1 eq. of hyponitric acid. When nitrobenzol is heated with an alcoholic solution of caustic potassa, and the product subjected to distillation, a red oily liquid passes over ; this is a mixture of several substances from which, on cooling, large red crystals separate, which are nearly insoluble in . water, but...
Page 428 - ... acid has the same effect with precipitation of iodine : it reduces gold from its chloride without disengagement of carbonic acid; but it does not reduce mercury from its nitrate or sulphate, as formic acid does. The simplest reagent for purifying common vinegar is recently calcined wood charcoal...

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