Hand-book of Chemistry, Band 13Cavendish Society, 1859 |
Inhalt
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
acetic acid action alcoholic solution aldehyde alkaline ammonia anhydrous anisic anisic acid aqueous solution baryta becomes boiling alcohol boiling water Bouis bromide brown caffeine Cahours carbonic acid Chem Chim chinoline chloric acid chloride of calcium cinnamic acid colour colourless compound Compt containing cooling crystallises crystals cyanide decomposed decomposition deposits dilute dissolves readily distilled dried ethylamine ethylene evaporated evolved excess filtered filtrate Formation forms formula Gerhardt glycol heated Herzog Hofmann hydrate of potash hydrochloric acid indigo insoluble iodide of ethyl isatin Kopp Laurent lime liquid melts mercuric mixed mixture Mulder needles neutral nitrate of silver nitric acid obtained odour oil of vitriol oxalic acid oxide Pharm Phys potassium powder precipitate Preparation prisms purpurin rend residue resin salt saturated separates small quantity soda sodium solidifies soluble in alcohol soluble in water suberic acid sulphate sulphuric acid temperature treated vacuo vapours yellow yields
Beliebte Passagen
Seite 160 - The filtrate is evaporated to the consistence of a thick syrup, and the residue is treated with a mixture of three parts absolute alcohol and one part ether, as long as it continues to grow turbid. A precipitate of sulphate of ammonia is thus formed, from which the liquid is filtered and then distilled; and the residue is heated in a water-bath and repeatedly moistened with water, until no more alcoholic vapours are perceptible. On cooling, the mass is found to contain a number of micaceous lamina?,...
Seite 94 - ... its slight solubility, partly thrown down as a white precipitate, and partly remains dissolved in the aqueous solution, to which it imparts a yellow colour; it turns blue on exposure to the air. — The compound of indigo-white and alumina is white, but rapidly turns blue on the filter; if it be then dried, it forms a dark blue crystalline powder which sparkles in sunshine; indigo-blue may be very readily sublimed from it and a grey earthy residue then remains. (Berzelius.) The...
Seite 386 - CailH2a~e homologous with benzol. 1. The oil has a specific gravity of 0750 at 15°, and begins to boil at 141°. By treating it with fuming nitric acid or with a mixture of nitric and sulphuric acids, separating that portion of the oily liquid which is not altered by the action of the acid, washing it with aqueous alkali...
Seite 429 - By repeated rectification of these liquids, the pure monoacetate is obtained, boiling at 182°. — In the first distillation the liquid often jumps violently in consequence of the separation of a little bromide of potassium ; in this case, an equal volume of ether must be added to precipitate the bromide of potassium, and the liquid filtered (Atkinson).
Seite 38 - ... are slaked; and to this is added a solution of 3 pts. of sulphate of iron free from copper, the whole being stirred. (If the sulphate of iron is yellowish, one-third more is taken.) Water is then added to the amount of 100 or 200 times the weight of the sulphate of iron, according as the dye is required dark or light, and the whole, after being stirred, is allowed to rest. The proportions quoted are those most commonly employed in dyeing; when the indigo is particularly pure, more lime and sulphate...
Seite 48 - The solution is evaporated to dryness and the residue is dissolved in 10% HN03.
Seite 68 - Carbonic acid is then passed through the liquid: the filtrate evaporated to dryness, and the green brownish yellow residue extracted with alcohol. The yellow solution is precipitated with acetate of lead; the lemon-yellow precipitate suspended in water and decomposed by sulphuretted hydrogen; and the solution filtered from the sulphide of lead, is then left to evaporate. It forms yellow arborescent masse?, having a strong acid taste and reaction.
Seite 160 - The distillate, consisting of a watery liquid and oily conine, which still contains water in solution (whence it becomes turbid when heated) is mixed with chloride of calcium as long as the latter continues to absorb water, and then distilled; ammonia is then evolved, and there remains a brown resinous residue. The distillate is again treated with chloride of calcium and distilled in a sand-bath, and the product, which is almost colourless, is rectified alone : it then leaves a small resinous residue.
Seite 429 - By the action of acetate of potassium on chloride of ethylene. The decomposition does not take place so readily as with the bromide, and requires the mixture to be heated for three or four days (Atkinson).— 3. By heating a mixture of 1 at glycol and 1 at. acetic anhydride in a sealed tube for several hours at a temperature not exceeding 170° C., and collecting apart the liquid which, in the subsequent distillation, passes over between 180° and 186° C.
Seite 573 - As an additional precaution against tbe injurious effects of these vapours, the distillatiou and all the subsequent operations should be performed either in the open air, or under a chimney with a good draught. The...