Journal . concentruiiii a siiuuto sept. so. 11* THE JOURNAL OF THE SOCIETY OF CHEMICAL INDUSTRY. ! ! Apparatus for Absorption of Sulphuric and SulphurousAcids, iind for the Manufacture of Copper Sulphate(Rosalers system). Chem. Zeit 11, J74. This method is suitable for all cases in which, by solu-tion of metals in hot sulphuric acid, gas ous mix Iare evolve I containing SO and SOs mixed with lead lined iron c\ tinder < n is half-tilled with a satu-rated solution of CuS04, and precipitated copper isadded. After opening the valve Vj, a stream of the they all show the cha
Journal . concentruiiii a siiuuto sept. so. 11* THE JOURNAL OF THE SOCIETY OF CHEMICAL INDUSTRY. ! ! Apparatus for Absorption of Sulphuric and SulphurousAcids, iind for the Manufacture of Copper Sulphate(Rosalers system). Chem. Zeit 11, J74. This method is suitable for all cases in which, by solu-tion of metals in hot sulphuric acid, gas ous mix Iare evolve I containing SO and SOs mixed with lead lined iron c\ tinder < n is half-tilled with a satu-rated solution of CuS04, and precipitated copper isadded. After opening the valve Vj, a stream of the they all show the characteristic behaviour when placedapon water, as does the crystalline hydrate of sodium, Nalln --ll. see this Journal, 1887, 508), also i pared by the author.—I . A. mixed gases is drawn by means of the Kortings injectorLi, from the flue K, into the liquid through the perfor-ated tube 11. When all the copper has dissolved, thecylinder G_, is set at work, whilst 6| is allowed to cooland deposit the CuS04. Py this treatment the whole ofthe SOj aud the greater part of the SOs are removedfrom the gases.—A. G. G. The Crystallisation of the Alkaline Hydrates iolic Solution. C. Gottig. J. Prakt. Chem. 35,1887, 500—506. On heating a fairly concentrated solution of causticpotash in 90S per cent, alcohol to 60—80°, very tinemicroscopic crystals separate on the solution cooling to50°. Their composition is not constant. When driedthey form a fine powder, which loses its water of crystal-lisation on heating, and absorbs carbonic acid readilyfrom the air. When placed in contact with the water itmoves about over the surface until dissolved similarly tothe alkali metals. This behaviour is characteristic ofmost of the hydrates prepared by the author, and h
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