Chemical lecture experiments . lted and the heat gradually increased until they are vig- 132 CHEMICAL LECTURE EXPERIMENTS orously boiling. The vapor partially condenses in the neckof the retort and falls in a thin stream into a large beakerof water, in which is immersed an inverted funnel about thediameter of the beaker (Fig. G4). The sulphur solidifies, and the beaker should be slowly revolvedto allow the sulphur to collect in aspiral form on the funnel. It is ad-visable to ignite the sulphur vapor notcondensed in the neck of the retort, asotherwise the flowers of sulphur willsettle on the su
Chemical lecture experiments . lted and the heat gradually increased until they are vig- 132 CHEMICAL LECTURE EXPERIMENTS orously boiling. The vapor partially condenses in the neckof the retort and falls in a thin stream into a large beakerof water, in which is immersed an inverted funnel about thediameter of the beaker (Fig. G4). The sulphur solidifies, and the beaker should be slowly revolvedto allow the sulphur to collect in aspiral form on the funnel. It is ad-visable to ignite the sulphur vapor notcondensed in the neck of the retort, asotherwise the flowers of sulphur willsettle on the surface of the water andinterfere with the proper cooling ofthe sulphur. When the contents ofthe retort are vigorously boiling, aflame of sulphur vapor, some 10 to 15 cm. in length, issuesfrom the mouth of the retort. It is best to stop the heatbefore all the sulphur has been distilled. On withdraw-ing the funnel from the beaker the sulphur will be foundas a bundle of tine threads and will possess cc. retort. Fig. G4 large burner beaker and funnel; S. 4. Crystallization from fusion (prismatic sulphur). — A150 cc. Jena glass beaker is two-thirds filled with roll sul-phur, which is then carefully melted, care being taken tokeep the temperature as low as possible. When the sulphuris completely melted, the flame is removed and the beakerimbedded in a dish of sand. As soon as it is cooled suf-ficiently to form a crust on the surface, a hole is madethrough the crust and the remaining melted sulphur pouredout into water. A fine network of yellowish, transparentcrystals will have formed all around the walls of tin1beaker, the needles extending into the centre of themass. SULPHUR 133 5. Crystallization from carbon disulphide (octahedral sul-phur).— Sulphur is quite soluble in carbon disulphide, andcrystallizes from its solution in this solvent in octahedrons. Twenty grams of pulverized roll sulphur are placed in a100 cc. flask and covered with 50 cc. of carbon dis
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