A Manual of Quantitative Chemical Analysis for the Use of Students

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H. Holt, 1880 - 279 páginas
 

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Página 54 - ... and distilled water added. After some time the mass will slack and crumble in the manner of lime. Still better, this may be hastened by bringing the contents of the capsule to the boiling-point either over a lamp or water-bath; at the same time water is put into the crucible to slack...
Página 109 - ... particles of carbon may be observed. The operation should always be conducted under the same circumstances as to heat and length of time. The evolution of gas having ceased (in operating upon steel the reaction must continue two to three hours), place the tube in a large vase filled with water to bring the solution always to the same temperature. This precaution is indispensable because the same liquid is darker when warm than when cold. Afterward, pour off as exactly as possible the clear liquid...
Página 53 - The former amount is most commonly used, it being sufficient and best manipulated in the crucible; a gramme, however, may be conveniently employed. The weighed mineral is placed in a large agate mortar, or better in a glazed porcelain mortar, of half to one pint capacity. An equal quantity of the granular...
Página 74 - When the iron is quite dissolved, 30 grs. of the finely pounded and dried sample of manganese ore to be tested are put into the flask, the cork replaced, and the contents again made to boil gently over a gas flame until it is seen that the whole of the black part of the manganese is dissolved. The water in the small flask or beaker is then allowed to recede through the bent tube into the larger flask, more distilled water is added to rinse out the small flask or beaker and bent tube, the cork well...
Página 69 - C.) directly with strong solution of sodium carbonate in a platinum dish as above, filter and wash thoroughly with hot water. Acidify the filtrate with hydrochloric acid, evaporate to dryness, and determine the silica as usual. It represents (B) or the hydrated silicic acid. Add together the weights of (B) and (C), thus found, and subtract the sum from the weight of the first residue (A + B + C). The difference will be the weight of (A) or the silica in combination with the bases of the clay. If...

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