. Chemical News and Journal of Industrial Science . r nitrate inthe tower a, fused potassium hydroxide in the tower b,concentrated sulphuric acid in the tower c, and phosphoruspentoxide in the tubes d and e. All connections in the apparatus were made of fused orground glass. No lubricant whatever was used on theground joints and stopcocks which came in contact withhydrobromic acid, but these joints were so long and sowell ground that there could have been no diffusioninward. Either concentrated sulphuric acid or Ramsaydesiccator grease was used for lubrication in the nitrogenand air apparatus.
. Chemical News and Journal of Industrial Science . r nitrate inthe tower a, fused potassium hydroxide in the tower b,concentrated sulphuric acid in the tower c, and phosphoruspentoxide in the tubes d and e. All connections in the apparatus were made of fused orground glass. No lubricant whatever was used on theground joints and stopcocks which came in contact withhydrobromic acid, but these joints were so long and sowell ground that there could have been no diffusioninward. Either concentrated sulphuric acid or Ramsaydesiccator grease was used for lubrication in the nitrogenand air apparatus. In the final drying of the hydrobromic acid phosphoruspentoxide was not used on account of the danger of theformation of volatile phosphorus compounds (Baxter, Hines,and Frevert, jfonrn. Am. Chem. Soc, 1906, xxviii., 779).Calcium bromide was chosen for this purpose, because itsfirst hydrate has a very low aqueous pressure, 0-2 mm. at25^, , I litre of moist gas passed over fused calciumbromide retains only 0-0002 grm. of moisture (from results. through a tower, j, filled with beads moistened with silvernitrate solution, two similar towers, k and l, containingdilute sulphuric acid to eliminate last traces of ammonia,and two towers, m and n, filled with sticks of fused potas-sium hydroxide to absorb carbon dioxide and the first three experiments the partially dried gas, afterbubbling through bromine in a small flask, passed into asecond flask containing concentrated hydrobromic acidsolution in which carefully washed red phosphorus wassuspended, to convert the bromine into hydrobromic U-tube, also containing red phosphorus and hydro-bromic acid solution, removed traces of bromine, whichescaped reduction in the flask. Two additional U-tubes,containing beads moistened with concentrated hydrobromicacid solution only, served to eliminate volatile phosphoruscompounds. Finally the mixture of nitrogen and hydro-bromic acid gases was thoroughly dried by means of fus
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