Elements of Chemistry in the Order of the Lectures Given in Yale College Volum
Elements of Chemistry in the Order of the Lectures Given in Yale College Volum
Benjamin Silliman
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(a. ) Its properties are always shown by the alum of commerce, which is a triple salt, and not mere sulphate of alumina, which has characters entirely different. (b. ) Crystals formed from a hot concentrated solution, filtered ; a frame of sticks or some hairs or strings or wires are often suspended in it, for the crystals to adhere to ; they form a beautiful group, and are handsomely exhibited in a bottle. (c. ) Aqueous fusion and subsequent desiccation by heat, on an ignited iron ; the produc...t was formerly called alumen ustum ; there is a par- tial expulsion of the acid so that the solution of the desiccated alum does not easily redden blue vegetable colors. F By a very violent heat, most of the acid is expelled. The solution of the crystals red- dens litmus liquor decidedly, cabbage liquor slightly, " but blue tinc- tures, from the petals of plants, are generally turned by it green. "f (?. ) Air has generally no action sometimes produces a slight efflorescence. (e. ) Taste, sweetish, acid, and astringent; rather agreeable to most persons.
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