Elements of chemistry : including the applications of the science in the arts . alt evaporated between 158° and 176° (70° and 80° C), deposits quadrilateralcrystals, containing 1 equivalent of water, or per cent. Carbonate of soda,IS 0rnnPPeaiS t0 be caPable of forming four definite hydrates, containing HO,tu TIt 10HO- The density of the anhydrous salt is (Filhol). Ihe solubility of the carbonate of soda, supposed to be anhydrous, at varioustemperatures, was observed by M. Poggiale to be as follows:— 100 parts of water at 32° (0° C.) dissolve of carbonate of soda. 100 « 50° (1
Elements of chemistry : including the applications of the science in the arts . alt evaporated between 158° and 176° (70° and 80° C), deposits quadrilateralcrystals, containing 1 equivalent of water, or per cent. Carbonate of soda,IS 0rnnPPeaiS t0 be caPable of forming four definite hydrates, containing HO,tu TIt 10HO- The density of the anhydrous salt is (Filhol). Ihe solubility of the carbonate of soda, supposed to be anhydrous, at varioustemperatures, was observed by M. Poggiale to be as follows:— 100 parts of water at 32° (0° C.) dissolve of carbonate of soda. 100 « 50° (10° C.) « 100 68° (20° C.) » 25 83 « « 100 << 86° (30° C.) « 100 » ° (104° C.) To obtain such determinations of the solubility of a salt at a given temperature,water is kept in contact with a considerable excess of the salt in the state of powderfor at least half an hour, at the fixed temperature, with occasional agitation. Abouttwo ounces of the solution is then transformed into a light glass flask (fig. 173), and Fig. after being accurately weighed, is evaporated either over the gas, or by a smallfurnace, taking care to hold the neck at an angle of 45°, to avoid drops of fluidbeing thrown out by the ebullition. After the salt is dry, the heat is still continued,to expel the water of crystallization, the escape of the latter being promoted byblowing air gently into the flask while hot by means of bellows having a bent glasstube attached to the nozzle. This salt has a disagreeable alkaline taste! When heated, it undergoes the wateryfusion; its water is soon dissipated, and a white anhydrous salt remains, which againbecomes liquid at a red heat, undergoing then the igneous fusion, and by a greaterheat it loses no carbonic acid. A mixture of carbonates of potassa and soda is morefusible than either salt separately. Carbonate of soda is decomposed at a bright red heat by the vapour of water,which disengages all the carbonic
Size: 2167px × 1153px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, bookpublisherphila, bookyear1853
