Journal of the Chemical Society, Band 56,Teil 1 |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
Abstr action added addition alcohol alcoholic solution alkalis ammonia ammonium amount analysis aqueous barium base becomes benzene boiling bromine calcium carbonic carbonic anhydride cent Chem chloride chloroform cold colour colourless composition compound concentrated containing converted crystallises crystals decomposed decomposition described determined dilute dissolves distilled Estimation ether ethyl evaporated excess experiments extracted formation formed given gives grams heated hydrochloric acid hydrogen increase insoluble iodide latter lead light liquid means melts metal method mixed mixture mols needles nitrate nitric acid nitrogen obtained ordinary oxide passed plates potash potassium powder precipitate prepared present pressure prisms probably pure quantity reaction readily soluble reduced residue salt separates silver similar sodium soluble in alcohol soluble in water solution sparingly soluble substance sulphide sulphuric acid temperature tion treated tube warm washed weight yellow yields
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.
Bibliografische Informationen
| Titel | Journal of the Chemical Society, Band 56,Teil 1 |
| Autor/in | Chemical Society (Great Britain) |
| Mitwirkende Personen | Royal Society of Chemistry (Great Britain) |
| Veröffentlicht | 1889 |
| Original von | University of Michigan |
| Digitalisiert | 28. Juni 2007 |
| Zitat exportieren | BiBTeX EndNote RefMan |