Select Methods in Chemical Analysis: (chiefly Inorganic) |
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Common terms and phrases
acetic acid added alcohol alkaline aluminium ammonia ammonium sulphide amount analysis antimony arsenic assay barium barium chloride beaker bismuth boiling bromine calcium carbonic acid caustic cent chlorate chromic acid citron band cobalt colour containing cool copper crucible cyanide decantation decomposed didymium dilute dissolved distilled dried drops estimation evaporated to dryness excess ferrocyanide filter filtrate flask fused gallium glass grains grammes heat hydrate hydrochloric acid hydrogen ignited insoluble iodide iodine iridium iron lead liquid litre magnesium manganese mercury metals method mineral mixed mixture nickel nitrate nitric acid obtained operation oxalate oxide oxidised permanganate peroxide phosphate phosphoric acid platinum porcelain portion potash potassium chlorate powder precipitate present pure reaction reagent redissolved residue ruthenium salt separated sesquioxide silica silver small quantity sodium carbonate soluble solution of potassium sulphate sulphuretted hydrogen sulphuric acid temperature thallium thiosulphate tion titanic acid traces treated tube uranium washed water-bath weighed whilst zinc
Popular passages
Page 615 - Now it is also clear that as the volume of a gas is inversely as the pressure to which it is subjected...
Page 28 - ... capacity, and during the evaporation is never filled to more than two thirds its capacity. After the filtrate has been evaporated over the waterbath to dryness, the bottom of the dish is dried, and, on a proper support, heated very 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 spitting of the salt after the sal-ammoniac has been driven off.
Page 33 - After the fused mass has been treated with water, filtered and washed, as in (54), the filter and its contents are dried ; the latter are detached from the filter, and rubbed up in a glazed mortar with an amount of sal-ammoniac equal to one-half the weight of the mineral, and reheated in a platinum crucible exactly as in the first instance, treated with water, thrown on a filter and washed, the filtrate added to that from the first fusion, the whole treated with carbonate of ammonia, and completed...
Page 681 - For ordinary purposes, however, it is still more convenient to introduce into the liquid about to be distilled a small fragment of sodium amalgam, or, in cases where the liquid is acid, a small piece of sodium-tin. Methylic alcohol is well known to be one of the most difficult liquids to distil, yet on the introduction of a minute piece of sodium amalgam or sodium tin it can be distilled without the slightest inconvenience.
Page 30 - On the contents of the capsule, as taken either from the water-bath or as after being heated over the lamp, pure dilute sulphuric acid is poured (1 part acid, 2 water), and the contents boiled for a little time, when all the nitric acid and chlorine in combination with the alkalies will be expelled ; the acid solution of the alkalies is now poured into a platinum capsule or crucible, evaporated to dryness, and ignited. In order to...
Page 173 - I concluded that the best way of so doing would be to use a precisely contrary method, namely, by liberating the phosphorus as a hydrogen compound ; but one objection naturally arose — would the totality of the phosphorus pass into the state of a gaseous product? I may safely affirm that I have never been able to discover the least trace of phosphorus in the residue after the complete attack of the cast-iron by chlorhydric acid, which fact is not surprising if it be considered...
Page 33 - In many analyses made, one fusion sufficed for the entire extraction of the alkalies; but as a few tenths would occasionally remain behind, we preferred the additional fusion to get at that small quantity, and to entitle it to rank as a method by which all but the merest trace of the alkalies could be extracted from the insoluble silicates. 59. The proportion of sal-ammoniac added to the carbonate of lime as here recommended, was arrived at after numerous experiments.
Page 385 - If the least trace of bismuth is present in the lead-salt, the repreeipitatcd scales are no longer yellow, but assume a dark orange or crimson tint, varying in intensity of colour according to the amount of bismuth present. This test is of such extraordinary delicacy, that 0'00025 of...
Page 444 - The solution of the nitrates is poured off the residue which is washed by decantation, and the solution and washings are evaporated to dryness, and then calcined at a strong red heat. In this way the palladium is reduced, and the iron and copper pass to the state of oxides, which are easily separated from the palladium by means of strong hydrochloric acid. The palladium remains in the crucible in which it is again strongly ignited and then weighed. The chlorides of iron and copper are now evaporated...
Page 321 - ... methods fail in certain extreme cases to give satisfactory results. It often happens that veins of iron pyrites lead at greater depths to copper pyrites. In this case, according to the experience of the writer, the iron pyrites will almost invariably hold minute traces of copper. Hence the desirability, on exploring expeditions more especially, of some ready test by which, without the necessity of employing.