Qualitative chemical analysis and laboratory practice / by T.E. Thorpe and M.M. Pattison Muir.
- Thomas Edward Thorpe
- Date:
- 1894
Licence: Public Domain Mark
Credit: Qualitative chemical analysis and laboratory practice / by T.E. Thorpe and M.M. Pattison Muir. Source: Wellcome Collection.
110/273 (page 88)
![LESSON XXV. PREPARAXrON AND PROPERTIES OF PHOSPHORETTED HYDROGEN. Fit a cork carrying an exit tube into a small round- bottomed flask supported on a clamp, in which you have placed a fairly cone, solution of caustic potash and a few pieces of phosphorus. Connect the end of the exit Fig. 42. tube, by means of a caoutchouc tube, with the gas tap, and ]iass coal gas into the apparatus, the cork being loosely held in its place, until the air in the apparatus is entirely displaced by the coal gas. Now shut the gas tap, remove the caoutchouc tube, fit the cork tightly into the flask, and quickly plunge the end of the exit tube under water in a pneumatic trough. On now heating the flask a gas is evolved, each bubble of which, as it passes out of the water into the air, spontaneously inflames, and produces a ring of white smoke (see fig. 42). The chief reaction which takes place may be thus formulated : 4? -1- 3H2O + 3KHO Aq = 3KH,P02 Aq + PH3.](https://iiif.wellcomecollection.org/image/b28122768_0112.jp2/full/800%2C/0/default.jpg)
