Chemical lecture experiments . heating a mixture of iodine androsin a considerable quantity of hydriodic acid gas isformed. Fifteen grams of finely powdered iodine are mixed withan equal bulk of finely powdered rosin. To regulate thereaction more satisfactorily, the mixture is intimately rubbedwith an equal volume of pulverized quartz or very fine powder is then placed in a dry 100 cc. Jena glass Erlen-meyer flask fitted with a one-holed cork and a glass tube,7 mm. wide, bent so as to extend nearly to the bottom of avertically clamped test-tube (Fig. 59). The test-tube isfitted with a
Chemical lecture experiments . heating a mixture of iodine androsin a considerable quantity of hydriodic acid gas isformed. Fifteen grams of finely powdered iodine are mixed withan equal bulk of finely powdered rosin. To regulate thereaction more satisfactorily, the mixture is intimately rubbedwith an equal volume of pulverized quartz or very fine powder is then placed in a dry 100 cc. Jena glass Erlen-meyer flask fitted with a one-holed cork and a glass tube,7 mm. wide, bent so as to extend nearly to the bottom of avertically clamped test-tube (Fig. 59). The test-tube isfitted with a two-holed stopper, in the second hole of whicha glass elbow is inserted. On heating the flask, hydriodicacid gas is liberated, mixed with considerable quantities offree iodine and an oily liquid, which condenses in the test-tube. To purify the issuing gas it should first be conducted 120 CHEMICAL LECTURE EXPERIMENTS through a U-tube filled with red phosphorus, and thenthrough a calcium chloride tube. This method gives a very. Fig. 59 good yield of hydriodic acid gas and is strongly to be recom-mended. 100 cc. Jena glass Erlenmeyer flask ; U-tube filled with red P ;CaCl2 drying-tube; powdered quartz or very fine sand; powderedrosin ; I. 15. By dissolving the gas in water. — A very simplemethod of obviating the difficulties attend-ing the absorption of this gas in water isthat of conducting the gas through thestem of an inverted funnel, the mouth ofwhich is thrust a few millimeters underthe surface of the water in a crystallizingdish. If back suction occurs, air will bedrawn under the edge of the funnel beforethe water has risen in the cone of thefunnel as far as the 00 The funnel may be replaced by a retort.
Size: 1985px × 1259px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectchemist, bookyear1901
