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. 1911 edition. Excerpt: ...acid passes away; in preparing the light magnesium carbonate the heating should be discontinued as soon as the evolution of carbonic acid has commenced. When formed with hot, concentrated solutions, the mixture being boiled down to dryness, the precipitate contains less carbonic acid when formed, and loses ...
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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. 1911 edition. Excerpt: ...acid passes away; in preparing the light magnesium carbonate the heating should be discontinued as soon as the evolution of carbonic acid has commenced. When formed with hot, concentrated solutions, the mixture being boiled down to dryness, the precipitate contains less carbonic acid when formed, and loses more of that acid afterwards when exposed to the stronger heat. Light magnesium carbonate contains a greater proportion of true carbonate (MgCOa) and a correspondingly less proportion of hydroxide (Mg(OH)2). The quantity of water in the product seems also to vary. Description.--Light, white, friable masses, or a light, white powder; odorless; produces a slightly earthy feel in the mouth. Practically insoluble in pure water, although it imparts to it a slightly alkaline reaction. Insoluble in alcohol.. The foregoing description applies to the light variety. The heavy carbonate is a powder only one-third as bulky. MAGNESIUM OXIDE. MAGNESIUM OXIDE; U. S. P. LIGHT MAGNESIA. LIGHT MAGNE-SIUM OXIDE. (Calcined Magnesia.) MgO=40.2. Light magnesium carbonate. Rub it through a No. 60 sieve. Heat it in a capacious unglazed earthenware dish, with constant stirring, on a sandbath, until a sample removed from the center, cooled, mixed with a little water, and then dropped into diluted sulphuric acid, gives but a very slight effervescence. Reaction. (MgC03)4.Mg(OH)2.(H20)B when strongly heated is decomposed into 5MgO+6H20-f-4C02. Notes. The magnesium carbonate being very light, a great deal of it rises from the dish like dust and is scattered about. In operating upon larger quantities a bright, clean iron pot may be used, placed immediately over the fire and heated gradually to dull redness. If heated too strongly or too long the magnesia becomes...
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