4 14 Mr. Faraday on Fluid Chlotme. 



did not solidify. Heated up to 100° the yellow fluid ap- 

 peared to boil, and again produced the bright coloured at- 

 mosphere. 



By putting the hydrate into a bent tube, afterwai'ds herme- 

 tically sealed, I found it easy, after decomposing it by a heat 

 of 100°, to distil the yellow fluid to one end of the tube, and 

 to separate it from the remaining portion. In this way a 

 more complete decomposition of the hydrate was effected, and, 

 when the whole was allowed to cool, neither of the fluids so- 

 lidified at temperatures above 34°, and the yellow portion not 

 even at 0°. When the two were mixed together, they gra- 

 dualh'^ combined at temperatures below 60°, and formed the 

 same solid substances as that first introduced. If, when the 

 fluids were separated, the tube was. cut in the middle, the parts 

 flew asunder as if with an explosion, the whole of the yellow 

 pon'on disappeared, and there was a powerful atmosphere 

 of chlorine produced ; the pale portion on the contrary re- 

 mained, and when examined, proved to be a weak solution of 

 chlorine in water, with a little muriatic acid, probably from 

 the impurity of the hydrate used. When that end of the 

 tube in which the yellow fluid lay was broken under a jar of 

 water, there was an immediate production of chlorine gas. 



I at first thought that muriatic acid and euchlorme had 

 been formed ; then, that two new hydrates of chlorine had 

 been produced; but at last I suspected that the chlorine had 

 been entirely separated from the water by the heat, and con- 

 densed into a dry fluid by the mere pressure of its own abun- 

 dant vapour. If that were true, it followed, that chlorine gas, 

 when compressed, should be condensed into the same fluid, 

 and, as the atmosphere in the tube in which the fluid lay was 

 not very yellow at 50° or 60°, it seemed probable that the 

 pressure required was not beyond what could readily be ob- 

 tained by a condensing syringe. A long tube was therefore 

 furnished with a cap and stop-cock, then exhausted of air and 

 filled with chlorine, and being held vertically with the syringe 

 upwards, air was forced in, which thrust the chlorine to the 

 bottom of the tube, and gave a pressure of about 4 atmo- 

 spheres. Being now cooled, there was an immediate deposit 

 in films, which appeared to be hydrate, formed by water con- 

 tained in the gas and vessels, but some of the yellow fluid was 

 also produced. As this however might also contain a portion 

 of the water present, a perfectly dry tube and apparatus were 

 taken, and the chlorine left for some tune over a bath of sul- 

 phuric acid before it was introduced. Upon throwing in air 

 and giving pressure, there was now no solid film formed, but 

 the clear yellow fluid was deposited, and more abundantly 



stiil 



