 | Andrew Alexander Blair - 1876 - 456 Seiten
...ashless filter, wash, dry, ignite, and weigh the insoluble silicious matter. Treat this in the crucible with hydrofluoric acid and a few drops of sulphuric acid, evaporate to dryness, ignite, and weigh. It is evident now that if the insoluble silicious matter contains calcium, magnesium, potassium, or... | |
 | Howard Van Fleet Furman - 1893 - 512 Seiten
...allow the insoluble matter to settle. Filter, wash, dry, ignite, and weigh the insoluble residue. Treat with hydrofluoric acid and a few drops of sulphuric...acid, evaporate to dryness, ignite, and weigh, the loss being silica. Should any appreciable residue remain, fuse it with sodium carbonate, dissolve the... | |
 | Charles Frederick Sidener - 1904 - 72 Seiten
...heat, filter, wash and ignite and weigh the insoluble residue in a platinum crucible. Treat the residue with hydrofluoric acid and a few drops of sulphuric acid; evaporate to dryness; ignite and weigh. In almost all iron ores the loss in weight would represent the silica. If. however, the insoluble residue... | |
 | 1908 - 634 Seiten
...blast lamp and weigh the residue. Moisten this with a drop of water and add a few cc. of hydrofluoric acid. Evaporate to dryness, ignite and weigh. The difference between the two weights represents SiO2. SiO2Xo.47=Si. Note — When only small quantities of other elements than copper and... | |
 | Iowa Geological Survey - 1907 - 672 Seiten
...45 cc water. Allow it to stand in a warm place for fifteen or twenty minutes, add 50 cc water, and stand in a warm place for fifteen or twenty minutes,...a large platinum dish, heat it to boiling, add an • Blair's Chemical Analysis Iron, 6th Ed. 1906, p. 278. excess of ammonia, boil until the smell of... | |
 | 1907 - 656 Seiten
...45 cc water. Allow it to stand in a warm place for fifteen or twenty minutes, add 50 cc water, and stand in a warm place for fifteen or twenty minutes,...little hydrochloric acid, and wash it out into the nitrate from the silica. Transfer the filtrate from the silica to a large platinum dish, heat it to... | |
 | Henry Alfred Gardner, John Ahlum Schaeffer - 1910 - 122 Seiten
...water, f1lter, and weigh the insoluble residue. Treat the contents of the crucible with an excess of hydrofluoric acid and a few drops of sulphuric acid, evaporate to dryness, and ignite. The loss will be silica. Any residue remaining after this treatment should be examined.... | |
 | William Benham Price, Richard Kidder Meade - 1911 - 288 Seiten
...with water, add 10 drops of sulphuric acid and enough hydrofluoric acid to dissolve it completely, evaporate to dryness, ignite and weigh. The difference between the two weights is silica. The following method is fully as accurate and is much more rapid. Dissolve 1 gram of the finely divided... | |
 | William Benham Price, Richard Kidder Meade - 1911 - 288 Seiten
...weigh the residue. Moisten this with a drop of water and add a few cubic centimeters of hydrofluoric acid. Evaporate to dryness, ignite and weigh. The difference between the two weights represents Si02. Si02 X 0.47 = Si. NOTE. — When only small quantities of other elements than copper... | |
 | Andrew Alexander Blair - 1918 - 334 Seiten
...to dryness, place the filter containing the tungstic acid in it, ignite and weigh. Treat the residue with hydrofluoric acid and a few drops of sulphuric...acid, evaporate to dryness, ignite and weigh. The loss is Silica. Then proceed as on page 196 for the determination of tungsten, etc. Determination of... | |
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... acidulate with hydrochloric acid, and evaporate to dryness in the air-bath. Treat the mass with water and a little hydrochloric acid, evaporate again to dryness, and treat with 15 cc hydrochloric acid and 45 cc water. Allow it to stand in a warm place... 