Works of the Cavendish Society: Gmelin, Leopold. Hand-book of chemistry. 18 v. & index. 1848-72, Volume 51850 - Chemistry |
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Common terms and phrases
acid gas alcohol alkaline ammonia anhydrous aqueous solution Arfvedson arsenic arsenious acid baryta becomes Berzelius bisulphide blue boiling water Bucholz carbonate of potash carbonic acid charcoal Chim chloride chromic oxide chromium colour colourless compound containing converted cooling crucible crystalline crystals dark decomposed decomposition deposits dilute dissolved in water dried Ebelmen evolves excess filtered filtrate forms fused green solution hydrated hydro hydrochloric acid hydrofluoric acid hydrogen gas hydrosulphuric acid ignited insoluble likewise liquid manganese manganous oxide mass metallic mixed mixture molybdenum molybdic acid nitrate nitric acid obtained oil of vitriol ordinary temperatures oxygen Peligot peroxide of manganese Pharm phosphate Phys Pogg potassium powder precipitate protochloride protoxide Rammelsberg red heat residue sal-ammoniac salt saturated Schw sesquichloride of chromium sesquioxide small quantity soluble in water sulphate sulphide sulphuric acid tantalic acid tersulphide tungstate tungsten tungstic acid uranic oxide uranium uranoso-uranic oxide vanadic vanadic acid vanadic oxide vanadium vapour washed Wöhler yields
Popular passages
Page 262 - When sulphuretted hydrogen is passed through aqueous arsenic acid, the liquid becomes turbid, sometimes in a few minutes, sometimes not for hours; the stronger the solution, the sooner does it become turbid; ultimately, the arsenic is completely precipitated in the form of pentasulphide, but not till the gas has been passed through the solution for a long time. AsO5 + 5HS = AsSs + 5HO.
Page 276 - ... is not complete, till the solution is concentrated to the crystallizing point of the latter salt. If the decomposed mass be digested in a large quantity of water and boiled, the whole is reconverted into sulpharsenite and redissolved. The solutions of the barium, strontium, calcium, and magnesium salts, containing 1 As. base to 1 At. acid, deposit, on boiling, a portion of the arsenious sulphide; the ammonium, potassium, sodium, and lithium compounds remain undecomposed. On adding alcohol to...
Page 251 - As j3, is produced when arsenic is very strongly heated, or when it condenses by sublimation on a part of the vessel the temperature of which is near the point at which the arsenic volatilizes, so that the metal is deposited in an atmosphere of its own vapour. This modification is nearly white, has a strong metallic lustre, is denser than the preceding, and remains unaltered in the air, even though finely pounded and heated to 70° or 80°, and perhaps even above 100°.
Page 134 - Dumas has suggested that the compound produced when anhydrous sulphuric acid is conducted into an atmosphere of dry ammonia, may be considered hydrated sulphite of amidogen : NH3, SO3=HO, NH2, SO,.
Page 380 - It yet remains to be determined whether these crystals are not hydrated sulphantimoniate of potassium. F. SULPHANTIMONIATE OF POTASSIUM. — This compound is likewise a kind of Liver of Antimony. — 1. It is prepared by a method similar to that used in the preparation of sulphantimonite of potassium, but with the addition of a sufficient quantity of sulphur, previous to fusion. — 2. By fusing tersulphide of antimony with a mixture of bisulphate of potash and charcoal. — 3. Or by fusing the same...
Page 292 - KO,2HO,AsO4 180-2 .... 100-00 100-00 .... 100-00 The crystals are permanent in the air, and give off but little water even at 288°. At a red heat, they fuse, give off water, and are converted into a pale yellow, very thin liquid, which, on solidifying, becomes white and opaque and splits in all directions. (Thomson.) The crystals dissolve in 5-3 parts of water at 6°, forming a solution of specific gravity 1-1134; they dissolve iu a much smaller quantity of hot water, but not in alcohol.
Page 26 - Found native. Formation. \. Tungsten does not oxidise in the air at ordinary temperatures; but at a red heat it takes fire, and, if in a state of powder, burns like tinder, producing tungstic acid. Under these circumstances 100 parts of tungsten absorb 24 parts of oxygen. (De Luyart.) Nitric acid and aqua-regia oxidize tungsten and convert it into tungstic acid. Water, hydrochloric acid, and sulphuric acid do not act on the metal. (De Luyart.) — 2. The brown oxide prepared by either of the first...
Page 307 - Non-crystalline, lemon-yellow mass, which is permanent in the air, does not absorb water from the air, dissolves in water in all proportions, and is not precipitated from the solution by alcohol. (Berzelius.) F.
Page 286 - The compound may therefore be kept for some time in glass vessels, in which it developes fluoride of silicium but slowly. It may be evaporated without decomposition in a glass vessel, to which the air has not excess; but if evaporated on glass in the open air, it is decomposed, the moisture of the air acting upon it in such a manner, that arsenious acid is left behind. It may be mixed — with more or less decomposition — with alcohol and ether, and somewhat less easily with oils, both fixed and...