The Chemical Gazette, Or, Journal of Practical Chemistry, in All Its Applications to Pharmacy, Arts and Manufactures, Volumen5

Portada
William Francis, Henry Croft
R. and J. E. Taylor, 1847
 

Comentarios de la gente - Escribir un comentario

No encontramos ningún comentario en los lugares habituales.

Páginas seleccionadas

Contenido

Otras ediciones - Ver todas

Términos y frases comunes

Pasajes populares

Página 145 - Hamburg, and asked me whether I could give him a process for effecting this purpose. Now since, as far as I am aware, nothing has been published on this subject, and it is of very general interest, I consider it a duty to communicate the results of my experiments. I had already observed, in experimenting with explosive cotton, flax, &c., that these two substances behave somewhat differently towards concentrated acids; and although it has long been known that strong sulphuric acid converts all vegetable...
Página 146 - If it contained cotton, the cotton threads are found to be wanting in that portion which had been immersed in the acid ; and by counting the threads of the two portions of the sample, its quantity may be very readily estimated. If the sample has been allowed to remain too long in sulphuric acid, the linen threads likewise become brittle, or even eaten away ; if it were not left a sufficient time in it, only a portion of the cotton threads have been removed ; to make this sample useful, it must be...
Página 143 - WHEN some sulphuret of ammonium and caustic ammonia are added to a concentrated aqueous solution of prussic acid, and the mixture heated with the addition of pure flowers of sulphur, the prussic acid is converted in a few minutes into sulphocyanide of ammonium.
Página 365 - ... and after being washed and dried is reduced in a platinum or porcelain crucible by hydrogen gas. The fluid filtered from the superoxide of cobalt is of a pure green colour. It is free from any trace of cobalt . After the removal of the baryta by means of sulphuric acid, the oxide of nickel is precipitated by caustic potash. Even this method did not give exact results on the first trial. 0-318 grm.
Página 432 - The patentee says he does not confine himself to any proportions, but that the process he usually adopts is to bring together common salt, nitrate of soda or nitric acid, and sulphuric acid, in suitable proportions; heat being then applied, chlorine, an oxide of azote, and muriatic acid, are evolved ; these gases are caused to pass through a condenser charged with sulphuric acid, of sufficient strength to absorb the oxide of azote ; and then the chlorine and muriatic acid are separated by means of...
Página 101 - ... is, the excess over and above what is necessary to form alkaline or earthy bicarbonates, this excess having the property of slowly decomposing a lather once formed. For this purpose, before measuring out the water for trial, it should be shaken briskly in a stoppered glass bottle...
Página 365 - A current of chlorine gas is then passed through the solution for several hours : the fluid must be thoroughly saturated with it, and the upper part of the flask above the liquid must remain filled with the gas after the current has ceased. Carbonate of baryta in excess is then added, and the whole allowed to stand for 12 or 18 hours, and frequently agitated. The precipitated...
Página 42 - ... maintained for 12 hours, and assisted by a current of dry hydrogen, suffices to expel these three bodies, so that the nicotine passes pure and colourless, when the temperature is subsequently raised to 356°. 2 Ibs. of good tobacco, grown in the department of Lot, is capable of yielding by this process from 50 to 60 grms. of nicotine. The formula for nicotine, C*° HM Na, proposed by M.
Página 143 - ... of sulphur are added ; and then the product resulting from the distillation of 6 oz. prussiate of potash, 3 oz. of the hydrate of sulphuric acid, and 18 oz. water. This mixture is digested in the water-bath until the sulphur is seen to be no longer altered and the liquid has assumed a yellow colour ; it is then heated to boiling, and kept at this temperature until the sulphuret of ammonium has been expelled and the liquid has again become colourless. The deposited, or excess of, sulphur is now...
Página 128 - ... hours, by which time the mass will have become partially decomposed and disintegrated. The excess of water is then run off, and the mass removed, and allowed to remain in a heap until the whole is reduced to a fine powder, which will be in about 24 hours.

Información bibliográfica