Quarterly Journal of the Chemical Society of London, Band 56,Teil 1 |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
acid solution action added alcoholic solution alkalis ammonia ammonium aniline aqueous solution barium barium salt benzaldehyde benzene boiling bromine calcium carbonic anhydride cent Chem chloric acid chloroform cold colour colourless needles compound Compt concentrated containing converted crystallises crystallises from alcohol crystallises in needles crystals cyanide decomposed decomposition dissolves distilled ether evaporated extracted ferric chloride filtered formed glacial acetic acid grams H₂O hot alcohol hot water hydrochloric acid hydrogen chloride hydroxide insoluble iodide isomeric light petroleum liquid mercury method methyl iodide mixture molecular mols needles melting nitrate nitric acid nitrogen obtained oxide oxidised oxygen phosphorus plates platinochloride potash potassium precipitate prepared by heating pressure prisms proteïds reaction readily soluble rend residue separates small quantity soda sodium carbonate soluble soluble in alcohol soluble in hot soluble in water sparingly soluble substance sulphate sulphuric acid temperature tion treated tube yellow needles yields Zeit zinc
Beliebte Passagen
Seite 462 - B with the sound velocity where y is the ratio of the specific heat at constant pressure to the specific heat at constant volume, and p is the gas pressure.
Seite 55 - Injected into the blood, sodium salt proves fatal, causing cramp and paralysis of the respiratory organs and brain. On the other hand, it may be imbibed into the stomach without injury to the extent of 500 times the quantity which proves fatal when injected into the blood.
Seite 305 - A more delicate test for excess of the dichromate is, however, Wurster's tetramethylparaphenylenediamine paper. Potassium dichromate in an acetic acid solution acts in the same way as ozone, to test for which the paper was originally used ; it turns it blue. The titration is carried out as follows : — The solution of barium chloride is placed in a beaker, and a quarter of its volume of alcohol added, then a few cc. of a 10 per cent, solution of sodium carbonate containing 10 per cent, of acetic...
Seite 631 - Eugling states that the calcium salts in milk are not precipitated by ammonium oxalate. The author finds that 85 per cent, of the calcium is precipitated ; at the same time there is a change in the appearance of the milk which indicates that the reactions which take place extend to the casein, probably with formation of an ammonium salt, Serum obtained by sodium chloride, and that obtained by alcohol, are both precipitated by ammonium oxalate, just like the serum produced by rennet. Eugling's negative...
Seite 325 - Five grams of the finely-powdered nux-vomica seeds is treated in an extraction apparatus with 40 cc of a mixture of three parts of chloroform and one part of alcohol for two to three hours. The extract is agitated with 25 cc of 10 per cent, sulphuric acid, and again with 15 cc of the same acid, the acid solution is separated from the chloroform in a separating funnel, and made alkaline with ammonia, after which the free alkaloid is shaken with 25 cc of chloroform. The chloroform solution is evaporated...
Seite 87 - He finds that the chromate process gives very varying results, but on the average gives the highest yield of cinchonidine, especially with the purer samples. The oxalate test gives the lowest numbers, but they are more concordant than those of the chromate process. The composition of the bye-product is, however, variable. The bisulphate test gives results varying considerably. The alkaloids in the ethereal solution ought to be submitted to the process a second and even a third time, but even with...
Seite 305 - In this method, potassium dichromate is added to the barium solution, by which means a precipitate insoluble in water and acetic acid is formed; the indicator of the end of the reaction is the yellow colour which the smallest excess of the dichromate gives to the liquid which Heats over the precipitate.
Seite 170 - ... at 45°. The residue is acidified, heated for a moment at 100°, and extracted with alcohol at 85°. The latter dissolves the acid, which separates as a viscid, colourless substance on cooling or on adding water. The crude product is dissolved in potash, neutralized with nitric acid, and lead acetate added so long as the precipitate is not discoloured. The lead precipitate is washed with water, decomposed by hydrogen sulphide, and the solution filtered whilst hot. The lead sulphide is washed...
Seite 55 - The sodium salt acts as a very severe caustic on the tongue and throat, and the smallest particles coming in contact with the nose or throat cause violent sneezing and coughing. Brought on to the eye, it causes severe pain, flow of tears, and swelling of the lids. Injected into the blood, sodium salt proves fatal, causing cramp and paralysis of the respiratory organs and brain.
Seite 470 - Hg, Ag, Cu, Bi, Cd, Sb, Sn, Pb, Zn, Ni, Co, Fe, As, Tl, Mn.