Journal . hich is drawn out to a point, intothe flask. The nitric oxide passes through/, provided witha bulb, into the receiver B cooled in water. The UClcondenses here. The NO passes through q into C filledwith soda solution, where it is freed from the last trace ofHCl, and then into the absorption apparatus D and E. Dis a flask of 250 cc. capacity to which 20 cc. standard NaO;!solution and 30—50 cc. HjO; is added. Some of the liquor is djawn over into E by dipping theend o into the flask. D is then closed with a double-boredcork into which the tubes / and p are fitted; / does not dipinto the
Journal . hich is drawn out to a point, intothe flask. The nitric oxide passes through/, provided witha bulb, into the receiver B cooled in water. The UClcondenses here. The NO passes through q into C filledwith soda solution, where it is freed from the last trace ofHCl, and then into the absorption apparatus D and E. Dis a flask of 250 cc. capacity to which 20 cc. standard NaO;!solution and 30—50 cc. HjO; is added. Some of the liquor is djawn over into E by dipping theend o into the flask. D is then closed with a double-boredcork into which the tubes / and p are fitted; / does not dipinto the liquid. In order to determine the end of theireactionmetadiamidobenzene test paper is placed in the current ofgas by disconnectins the apparatus at h. A trace of JJUgives at once a brown stain. If no stain appears the alkalinesolution is withtlrawn and a second determination may beimmediately commenced. The three-way cock is turned sothat a is connected with c and the liquid in A is driven out Fig. I. ,. Fig. 2. Fig. 3. bottle is attached, serving as a mercury valve. If thepressure in the aspirator changes, a back-flow is preTentedby the mercury. If the gases passing through the aspiratorare soluble in water, the quantity dissolved is much de-creased by enclosing the inlet tube within a larger tube, asshown in the figure. The gases then pass through a narrowcolumn of water, and little absorption occurs.—J. B. C.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
