The Elements of Experimental Chemistry, Band 2

R. Desilver, 1819

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Seite 395 - ... frequently require to be corrected to what they would be at this point. For this purpose it is only necessary to compare the observed height with the mean height, or 30 inches, and increase or diminish the observed volume inversely in the same proportion. Thus, as the mean height of the barometer is to the observed height, so is the observed volume to the volume required. As an instance, suppose that 1 00 cubic inches of gas have been observed when the barometer stood at 30...
Seite 389 - WEIGHTS. The Paris pound, poids de mark of Charlemagne, contains 9216 Paris grains : it is divided into 16 ounces, each ounce into 8 gros, and each gros into 72 grains*. It is equal to 7561 English Troy grains. The English Troy pound, of 12 ounces, contains 5760 English grains, and is equal to 702 1 Paris grains.
Seite 52 - Into a dilute solution of muriate of gold, contained in a glass jar, put a long narrow slip of charcoal, and expose the whole to the direct light of the sun. The gold will be revived, and will appear on the charcoal in a metallic state, exhibiting a very beautiful appearance. The same change ensues without light, if the solution be exposed to a temperature of 212°.
Seite 14 - Phosphorus enters into combination with oxygen, azote, hydrogen, and carbon. Phosphorus is soluble in oils, and when thus dissolved, forms what has been called liquid phosphorus, which may be rubbed on the face and hands without injury. It dissolves too in ether, and a very beautiful experiment consists in pouring this phosphoric ether in small portions, and in a dark place, on the surface of hot water. The phosphoric matches consist of phosphorus extremely dry, minutely divided, and perhaps a little...
Seite 309 - ... apparent, unless after standing some time in contact with the air. By applying this test before and after evaporation, or boiling, we may know whether the iron be held in solution by carbonic acid, or by a fixed acid. For, 1. If it produce its effect before the application of heat, and not afterward, carbonic acid is the solvent. 2. If after, as well as before, a fixed and vulgarly called mineral acid is the solvent. 3. If, by the boiling, a yellowish powder be precipitated, and yet galls continue...
Seite 326 - It remains, therefore, first to discover and estimate the quantities of the bases present, and then, to complete the analysis, to find the quantity of muriatic acid originally contained. Add to the clear liquor a saturated solution of oxalate of ammonia as long as any turbid appearance is produced. The lime will be thrown down in the state of oxalate.
Seite 66 - One hundred grains (or a greater proportional quantity, not exceeding 500) are to be dissolved, with heat, in a measured ounce and a half of nitric acid. This solution being poured cold upon two measured ounces of alcohol, previously introduced into any convenient glass vessel, a moderate heat is to be applied till effervescence is excited.
Seite 53 - The degree of purity of gold is expressed by the number of parts of that metal, contained in the 24 parts of any mixture. Thus gold, which in 24 such parts (termed carats,) contains 22 of the pure metal is said to be 22 carats fine. Absolutely pure gold, using the same language, is 24 carats fine ; and gold alloyed with an equal weight of another metal, 12 carats fine-t Platinum.
Seite 118 - If two long trains be laid on a table, the one of gunpowder and the other of this mixture, and they be in contact with each other at one end, so that they may be fired at once, the arsenical mixture burns with the rapidity of lightning, while the other burns with comparative slowness, 28.
Seite 66 - The solution being poured cold upon two measured ounces of alcohol, previously introduced into any convenient glass vessel, a moderate heat is to be applied till effervescence is excited. A white fume then begins to undulate on the surface of the liquor, and the powder will be gradually precipitated on the cessation of action and re-action.

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