A college text-book of chemistry . as remaining isnitrogen. Of course, in this case as in all others in whichgas volumes are measured, corrections for temperature,pressure, and tension of aqueous vapor must be made. Another method by which the ratio between the nitrogenand oxygen in air can be determined is that which wasfirst employed by Dumas and Boussingault. It consists inpassing air over heated copper, collecting and measuringthe nitrogen, and weighing the copper oxide. The appa-ratus is arranged as shown in Fig. 47. The copper is contained in the glass tube ab on thecombustion furnace. A
A college text-book of chemistry . as remaining isnitrogen. Of course, in this case as in all others in whichgas volumes are measured, corrections for temperature,pressure, and tension of aqueous vapor must be made. Another method by which the ratio between the nitrogenand oxygen in air can be determined is that which wasfirst employed by Dumas and Boussingault. It consists inpassing air over heated copper, collecting and measuringthe nitrogen, and weighing the copper oxide. The appa-ratus is arranged as shown in Fig. 47. The copper is contained in the glass tube ab on thecombustion furnace. At the ends of this tube are thestop-cocks rr. V is a glass globe provided with a stop-cock u. Before the experiment the air is exhausted fromthe globe and the tube ab, and the tube then carefully 256 COLLEGE CHEMISTRY. weighed. The tubes B and C and the apparatus A con-tain substances which have the power to absorb the carbondioxide of the air. The tube ab is now heated and airadmitted after passing through G, B, and A. The copper. Fio. 47. takes up the oxygen, and the nitrogen enters the globe the globe is full it is weighed, then exhausted andweighed again, and the difference gives the weight of thenitrogen. The tube is also exhausted and weighed, andthe difference between this weight and that of the ex-hausted tube before the experiment gives the weight of theoxygen. The most refined method for the analysis of the air isthe eudiometric method of Bunsen. This consists inadding some pure hydrogen to a measured volume of aircontained in a eudiometer (see p. 74) over mercury, andthen exploding the mixture by means of an electric the conditions are right all the oxygen present willcombine with hydrogen, and in consequence of this therewill be a corresponding contraction in the volume of thegases. The amount of contraction will be equal to thevolume of hydrogen and that of oxygen which have com-bined to form water. But we know from previous experi-ments on these t
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