A Manual of Quantitative Chemical Analysis for the Use of StudentsHenry Holt, 1896 - 417 páginas |
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Términos y frases comunes
acetic acid acid solution acidified added alcohol alkaline allow alumina ammonia ammonium carbonate amount analysis antimony arsenic barium chloride beaker boiling burette c. c. of water calcium calculate carbonic acid caustic cent Chem chlorate chloric acid cipitate cold color cool copper cork crucible decant decomposed determination dilute dissolve distilled drops evaporate to dryness excess expelled ferric oxide ferrous filter filter-paper filtrate flask fluid fuse fusion glass H,SO heat hot water hydrate hydrochloric acid hydrogen sulphide ignition insoluble iron lime litre magnesium manganese metallic method mineral mixed mixture molybdate necessary neutral nickel nitric acid nitrogen obtained oxalate permanganate phosphate phosphoric acid platinum dish potassium potassium chlorate precipitate present proportion pulverized pure quantity reagent remove residue salts separation silica sodium carbonate solu soluble solution containing standard stirring substance sulphuretted sulphuric acid temperature tion Trace treated tube usually wash water-bath weighed zinc
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Página 72 - After this add eight parts of the carbonate of lime in three or four portions, and mix intimately after each addition^ Empty the contents of the mortar completely upon a piece of glazed paper that ought always to be under the mortar, and introduce into the crucible. The crucible is now tapped gently upon the table and the contents settled down. The crucible is then clasped by a metallic clamp in an inclined position, or it is placed in the...
Página 417 - No blank pages for notes. 158 pp. 12010. 50 cents net. 6. Political Economy. By FRANCIS A. WALKER, President Massachusetts Institute o'f Technology. Advanced Course. 537 pp. 8vo. $2.00 net. The same. Briefer Course.
Página 73 - The crucible is now allowed to cool, and, when cold, the contents will be found to be more or less agglomerated in the form of a semi-fused mass ; a glass rod or blunt steel point will most commonly detach the mass, which is...
Página 152 - The insoluble silica and graphite are thrown on a filter (which has been dried at 100° C. and carefully weighed), washed with cold water until the washings give no reaction for iron when tested with potassium ferrocyanide, then washed with boiling water containing 5 per cent of nitric acid. The silica and graphite are then dried on the filter at 100° C. and weighed, ignited in a porcelain crucible, and the weight carefully taken. The difference between the weighings before and after ignition gives...
Página 75 - ... gently by a Bunsen flame, to drive off the little sal-ammoniac. It is well to cover the capsule with a piece of thin platinum to prevent any possible loss by the...
Página 90 - 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).
Página 72 - 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 361 - When washed as usual with diluted ammonia, alkaline phosphate (N"a,HPO,, etc.) is not very rapidly removed, the salt being less soluble in ammonia than in water. Cond. — Absence of silica or any bases other than alkalies. NH,C1 or ammonium salts should be present. Sol. — Solution should be cold for precipitation and filtration. Soluble in acids, even when weak, in hot solutions, and, to some extent, in cold water ; insoluble in dilute ammonia. Contam. — Silica and Mg(OH)., or basic salts of...