Manual of Qualitative Chemical AnalysisJ. Wiley, 1867 - 434 páginas |
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Términos y frases comunes
acetic acid acid solution addition alcohol alkaline earths alumina ammonia antimony aqueous solution arsenic arsenious acid baryta binoxide blowpipe boiling carbonate of ammonia carbonate of soda carbonic acid chloric acid chloride of ammonium chloride of barium cobalt color colorless compounds contains copper crucible crystals cyanide of potassium decomposed detection dilute solutions dryness ether evaporate examination excess ferrocyanide filter filtrate flame fluid heat hydrate hydro hydrochloric acid hydrogen hydrosulphuric acid ignition insoluble latter lead lime liquid magnesia manganese mercury metallic mixed mixture neutral nitrate of silver nitric acid oxalic acid oxide phosphate phosphoric acid platinum portion potassa powder PRECIPITATE IS FORMED present produces quantity reaction reagent redissolves residue separation sesquioxide sesquioxide of iron silicic acid solu soluble in water solutions of salts strontia strychnia substance sulphate sulphide of ammonium sulphuric acid tartaric acid teroxide tersulphide tint tion treated tube undissolved volatile washed white precipitate yellow zinc
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Página 79 - 1 part of litmus of commerce with 6 parts of water, and filter the solution ; divide the intensely blue filtrate into 2 equal parts ; saturate the free alkali in the one part, by repeatedly stirring with a glass rod dipped in very dilute sulphuric acid, until the color of the fluid just appears red ; add now
Página 79 - other part of the blue filtrate, pour the whole fluid into a dish, and draw strips of fine unsized paper through it ; suspend these slips over threads and leave them to dry. The color of litmus paper must be perfectly uniform, and neither too light nor too dark.
Página 203 - correctly speaking, in the crystalline and in the amorphous state). It is insoluble in water and acids, with the exception of hydrofluoric acid ; whilst its hydrate is soluble in acids, but only at the moment of its separation. The amorphous silicic acid and the hydrate dissolve in hot aqueous solutions of caustic alkalies and of
Página 80 - parts of weak spirit of wine, filter the tincture obtained, and steep slips of fine paper in the filtrate. The dried slips must exhibit a fine yellow tint. Uses.—Turmeric paper serves, like reddened litmus paper and dahlia paper, for the detection of free alkalies,
Página 169 - tint, and show a bright metallic lustre ; whilst the antimonial stains are of a deep black color and but feebly lustrous. The arsenical stains may be distinguished moreover from the antimonial stains by solution of chloride of soda (compare § 134, 10), which will at once dissolve arsenical spots, leaving
Página 163 - hydrogen towards a solution of nitrate of silver is noticed in § 137, 6. 11. If a mixture of a compound of antimony with carbonate of soda and cyanide of potassium is exposed on a charcoal support to the reducing flame of the blowpipe, brittle globules of METALLIC ANTIMONY are produced, which may be readily recognised by
Página 92 - Very dilute solutions are not precipitated by this reagent. Free alkalies and free mineral acids dissolve the precipitate ; it is difficultly soluble in cold, but pretty readily soluble in hot water. In the case of acid solutions, the free acid must, if practicable, first be expelled by evaporation and ignition, or the solution must be
Página 213 - If only a very minute quantity of hydrocyanic acid is present, the fluid simply appears green after the addition of the hydrochloric acid, and it is only after long standing that a trifling blue precipitate separates from it. The same reactions are observed when sulphate of protoxide of iron containing
Página 17 - just on the border of a tolerably strong gas flame, and driving a moderate blast across it. The resulting mixture of the air with the gas is only imperfect, and there remains between the inner bluish part of the flame and the outer
Página 17 - long and 1^ to 2 millimetres wide ; as with the use of gas the operator is enabled to control and regulate not only the blowpipe flame, but the gas stream also. The task of keeping the blowpipe steadily in the proper position may be greatly facilitated by firmly resting that instrument upon some moveable metallic support, such as, for