Journal . ree feet on theenlargement in the tubes, and ground at the topto fit into the gixjund constriction. C and D con-nect the other pieces of apparatus. The bulb, E,contains clean mercury. When A and B havefallen. C communicates with D. By raising themercury in F, the floats are forced into the con-strictions, to make a gas-tight seal with a thin filmof mercury. The floats are made to fall again byexhausting E and opening the tap, G. Boron hydrides. V. Action of chlorine and bromineon B .Hr, and Bi„IIit. Ialeno/ of boron. E. Kuss. and O. Iriess. 1914. 47,3115—3149. J. Chem
Journal . ree feet on theenlargement in the tubes, and ground at the topto fit into the gixjund constriction. C and D con-nect the other pieces of apparatus. The bulb, E,contains clean mercury. When A and B havefallen. C communicates with D. By raising themercury in F, the floats are forced into the con-strictions, to make a gas-tight seal with a thin filmof mercury. The floats are made to fall again byexhausting E and opening the tap, G. Boron hydrides. V. Action of chlorine and bromineon B .Hr, and Bi„IIit. Ialeno/ of boron. E. Kuss. and O. Iriess. 1914. 47,3115—3149. J. Chem. .Soc, 108, —342. (Comparethis , 22; ) Some improvements in the preparation of BjHi.,are described. They consist chiefly in passing thecrude gas through a tube at —40^ C, wherebywhit« crystals of BioH,,. 995° C., arecollected, then through a large U-tube at —80° C. in which a little B,H,o, some silicon hydride,and, chiefly, BjH,2, are condensed, and finally. the main bulk of the gas is condensed by cooling^vith liquid air. The jaelds obtained from 100grms. of magnesium boride were BjHio, 95 (0° and 700 mm.), and B,oH,i, 0 02 grm. Theapparatus for the conversion of B,Hio by heatinto BoHj was also improved, and the BaHjwhich was pumped off from the liquid air con-densation was condensed in a bath made bystirring licjuid air into alcohol until the mass wasalmost solid. Such a bath maintains a tem-perature of —125° to —115H. for some hoursin a Dewar B^Hj condenses in needleswhen cooled .slowly, and is not attacked by dryoxygen to any extent after some days at ordinarytemperatures. Traces of moisture, however,decompose it at once, but hydrogen sulphidehas no action, even at 100° C. It inflames if theliquid is suddenly brought into the air (for example,when a breakage occurs). The action of bromineand chlorine on the solid BjoH,, was verysluggish ; replacement of hydrogen, and notaddition, was the rule. Thus, when
Size: 1209px × 2067px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
