Chemical lecture experiments . Fig. 7 20 CHEMICAL LECTURE EXPERIMENTS dish (sand bath) and heated until the surface begins to glow. The flame is then removed, and a stream of oxygen is passed through a long glass tube with abend at the end and allowed to- play over the surface of the glow-ing charcoal. The combustion be-comes very vivid, and if the streamof oxygen is of sufficient force toblow the dust out of the dish, thebrilliancy of the combustion isalmost blinding (Fig. 8).. Fig. 8 Iron dish (sand bath) ; powdered wil-low charcoal : current of O. 13. Combustion of sulphur. — A porcelain cr
Chemical lecture experiments . Fig. 7 20 CHEMICAL LECTURE EXPERIMENTS dish (sand bath) and heated until the surface begins to glow. The flame is then removed, and a stream of oxygen is passed through a long glass tube with abend at the end and allowed to- play over the surface of the glow-ing charcoal. The combustion be-comes very vivid, and if the streamof oxygen is of sufficient force toblow the dust out of the dish, thebrilliancy of the combustion isalmost blinding (Fig. 8).. Fig. 8 Iron dish (sand bath) ; powdered wil-low charcoal : current of O. 13. Combustion of sulphur. — A porcelain crucible aboutthe size of a thimble is so suspended in a loop of stout ironwire that it may be lowered into a jar of oxygen. Thecrucible is three-fourths rilled with small bits of lump sul-phur which are heated to boiling. On lowering the burningsulphur into a 500 cc. jar of oxygen, the combustion is con-tinued with great brilliancy, resulting in the productionof a blue flame. That the product of combustion differsmaterially from oxygen may be shown either by bleachingmoistened blue litmus paper or by thrusting a piece offilter-paper moistened with potassium dichromate solutioninto the jar. In the latter case the red color of the dichro-mate is turned deep green by reduction. s + o2 = so2. Small porcelain crucible and stout iron wire; 500 cc. jar ofoxygen ; lump sulphur; K2Cr207 solution. 14. Combustion of phosphorus. — (a) The brilliancy ofthe combustion of phosphorus
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectchemist, bookyear1901
