The Chemical Gazette, Or, Journal of Practical Chemistry, in All Its Applications to Pharmacy, Arts, and Manufactures, Volumen9William Francis, Henry Croft R. and J.E. Taylor, 1851 |
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Términos y frases comunes
acetate of lead acetic acid action æther æthylamine alcoholic solution alkaline alumina ammonia amount aqueous solution atoms baryta boiling water brown Carbon Hydrogen Oxygen carbonic acid caustic potash cent chloride chloride of calcium codeine cold colourless composition compound concentrated contains cooling copper crystalline crystals decomposed decomposition deposited diffusion dilute dissolved distillation dried at 212 equivs evaporated excess experiments filtered formed formula gallic acid grms heat hydrate hydrochloric acid hydrogen insoluble iodide iodine lime liquid magnesia mass mercury mesaconic mesaconic acid metallic methylamine mixed mixture moritannic acid muriatic acid neutral nitrate of silver nitric acid Nitrogen obtained odour oxalic oxide oxide of lead oxygen perchloride peroxide of iron phosphoric acid platinum portion potassium powder precipitate produced protoxide pure reaction residue resin separated small quantity soluble in water substance sulphate sulphuret sulphuric acid tained tannic acid temperature tion urea urine volatile washed
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Página 339 - O, perchloric acid. In order to accomplish what I above alluded to as a desideratum for the explanation of chemical reactions, namely effecting between the formulae of the reagents the interchange supposed to take place in the mixture, I have fixed the symbols of those atoms which have to change places upon the extremities of a piece of card, so fixed by a pivot to the board that by turning round 180° it reverses the positions of the exchanging atoms. I would not have brought before the public considerations...
Página 84 - ... and is replaced by that of hydrocyanic acid, and crystals are gradually deposited. In order to obtain the new compound in sufficient quantity, it is best to keep up a continuous slow current of cyanogen, by which means crystals are deposited during the action in considerable abundance. These are collected on a filter, and washed with a small quantity of alcohol ; and the filtrate, on being again exposed to the action of cyanogen, yields an additional quantity of crystals inferior in purity to...
Página 139 - ... the Royal Society, that the effect of tartrate of ammonia on the acidity of the urine was totally different from that of tartrate of potash, and that carbonate of ammonia, taken in very large quantities, did not produce any alkaline reaction of the urine, but that, on the contrary, the acidity was rather increased than diminished by such doses, repeated the experiments with carbonate of ammonia, hoping to obtain more decided results. Although, from these experiments, it was again apparent that...
Página 228 - ... one ten-thousandth part of silver. It was found that even this small portion of silver, sensibly modified the chemical relations of the metal, and observations had indicated that the quality for sheathing, was improved. Copper of this kind, is frequently met with in commerce and is derived from the Chilian ores of copper, which although argentiferous, do not yield enough silver, to render its separation economical. An occasion offered for again examining this subject, when the argentiferous native...
Página 199 - The next process in the manufacture of smalts is the apparently simple one of reducing the blue glass to powder. But, if we try the experiment of grinding to powder a portion of blue glass, we shall find that the substance, which by transmitted light had appeared so beautiful, is reduced in its disintegrated state to a light dingy powder ; yet who can doubt that the same amount of coloring matter is present in the powder as in the glass ? There are, therefore, difficulties to be overcome in converting...
Página 300 - ... cases to accumulation. Practical agriculture had, indeed, decided that phosphoric acid must be returned to the land from sources external to the farm itself, — viz., by bones, guano, or other means. But, on the other hand, artificial alkaline manures had generally been found to fail in effect Indeed, taking into careful consideration the tendency of all experience in practical agriculture, as well as the collective results of a most laborious experimental investigation of the subject, both...
Página 139 - The author having shown, in a paper lately communicated to the Royal Society, that the effect of tartrate of ammonia on the acidity of the urine was totally different from that of tartrate of potash, and that carbonate of ammonia, taken in very large quantities, did not produce any alkaline reaction of the urine, but that, on the contrary, the acidity was rather increased than diminished by such doses, repeated the experiments with carbonate of ammonia, hoping to obtain more decided results. Although,...
Página 119 - Beta- resin of madder. When prepared according to the method described in the paper, it is obtained in the form of a reddish-brown powder. When heated on platinum foil, it melts, and then burns away without leaving any residue. It dissolves in concentrated sulphuric acid, with a brown colour, and is reprecipitated by water in brown flocks. On heating the solution in concentrated sulphuric acid, it becomes black, sulphurous acid is disengaged, and the substance is decomposed. Concentrated nitric acid...
Página 53 - Since 1 grm. hydrate of potash (KO, Aq), in order to pass into neutral carbonate, absorbs at 32° F. 192 cub. centim. carbonic acid, the absorbent capacity of pyrogallic acid for oxygen, it will be seen, is not less than that of potash for carbonic acid. The following results, which were obtained with atmospheric air, will give an idea of the accuracy which is obtained by means of this method : — Volume of air after Decrease in introduction of volume after introduc- Per cent.
Página 197 - Nuremburg, and at length to Holland, where it was highly appreciated by the Dutch artists. They sought out the humble glass-maker of Neudeck, and invited him, by large promises, to reveal his secret. He took up his residence for a time in Magdeburg, and had the ores of Schneeberg conveyed thither for the purposes of his manufacture. But he afterwards returned to Neudeck, and constructed a hand-mill for grinding his glass to powder, and afterwards another, which was driven by water.