Chemical lecture experiments . Fig. 108 262 CHEMICAL LECTURE EXPERIMENTS 46. By the action of chlorine on phosphorus trichloride. —As was seen in Ex. 43 an excess of chlorine, when that ele-ment is acting on phosphorus, produces the pentachloriderather than the trichloride of phosphorus. Accordingly itis only necessary in preparing the pentachloride to act onthe trichloride with an excess of chlorine. The union of chlorine and phosphorus trichloride to formthe solid phosphorus pentachloride may be effected by pour-ing 3 cc. of phosphorus trichloride into a liter flask filledwith dry chlorine.
Chemical lecture experiments . Fig. 108 262 CHEMICAL LECTURE EXPERIMENTS 46. By the action of chlorine on phosphorus trichloride. —As was seen in Ex. 43 an excess of chlorine, when that ele-ment is acting on phosphorus, produces the pentachloriderather than the trichloride of phosphorus. Accordingly itis only necessary in preparing the pentachloride to act onthe trichloride with an excess of chlorine. The union of chlorine and phosphorus trichloride to formthe solid phosphorus pentachloride may be effected by pour-ing 3 cc. of phosphorus trichloride into a liter flask filledwith dry chlorine. A cork carrying a tube filled with cal-cium chloride (Fig. 108) is immediately inserted in theneck of the flask, which is then allowed to stand. After afew minutes the color will nearly all disappear from theflask, and the phosphorus pentachloride will remain as asolid mass on the bottom and walls. PCI, + CI, = PCI, Cork and CaCl2 tube ; liter flask of dry CI ; 3 cc. PROPERTIES 47. Sublimation. — Phosphorus penta-chloride sublimes without melting. Asmall quantity of the powder is heated in a test-tube, which is loosely sublimate soon appears on the upperpart of the tube. 48. Decomposition of phosphorus penta-chloride by water.— If a small quantityof water is allowed to drop on phosphoruspentachloride, the decomposition is very violent, resulting in the formation of theoxychloride. The apparatus shown in Fig. 109 con- PHOSPHORUS BROMIDES 263 sists of a wide-mouthed bottle with a cardboard cover inwhich an opening is made large enough to admit a test-tube. A few grams of the pentachloride are placed in thetest-tube and 1 drop of water from a long bent glass tubeis allowed to fall upon it. To prevent particles of thematerial from flying about, a large funnel having a cork inits stem is suspended mouth downwards over the more water is added, the conversion to phosphoric andhydrochloric acids becomes complete, the liquid remai
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