Chemical lecture experiments . hence in burning sulphur ina confined volume of oxygen the volume of the productremains the same as the volume of the oxygen used. A 700 cc. Jena glass distillation flask is filled with dryoxygen by displacement, and the arm connected with onelimb of a U-tube half filled with mercury (Fig. 68). The cork is provided with a glass rodcarrying a small platinum defla-grating-spoon at the end, in whichsulphur is burned. The deflagra-ting-spoon is easily made froma small piece of platinum foilwhich is fastened to the glassrod by means of platinum 4 mm. piece of r
Chemical lecture experiments . hence in burning sulphur ina confined volume of oxygen the volume of the productremains the same as the volume of the oxygen used. A 700 cc. Jena glass distillation flask is filled with dryoxygen by displacement, and the arm connected with onelimb of a U-tube half filled with mercury (Fig. 68). The cork is provided with a glass rodcarrying a small platinum defla-grating-spoon at the end, in whichsulphur is burned. The deflagra-ting-spoon is easily made froma small piece of platinum foilwhich is fastened to the glassrod by means of platinum 4 mm. piece of roll sulphur isplaced in the platinum spoon, andafter ignition in the air, is im-mediately thrust into the flask,where it continues to burn withgreat brilliancy. The cork must be firmly inserted in theneck of the flask, and the union between the U-tube and theflask must be very tight. As the sulphur burns, the gasesexpand, and the mercury rises in the open arm of the U-tube. On cooling, the gases contract, and at the end of the. Fig. 68 SULPHUR DIOXIDE 151 operation the level in the arms of the U-tube will be foundto be the same. 700 cc. Jena glass distillation flask; 1-holed rubber stopper;U-tube ; platinum deflagrating-spoon ; Hg; S. 38. From sulphuric acid and copper. — Sulphuric acid,when heated with copper, becomes reduced, liberating sul-phur dioxide. This reaction was formerly used to preparethe gas on the lecture table, but the method of Experiment41 is preferable. The gas may be prepared on the small scale by heating afew grams of copper clippings with concentrated sulphuricacid in a 100 cc. Erlenmeyer Jena glass flask. Cu + 2 H2S04 = CuS04 + 2 H20 + cc. Erlenmeyer flask ; Cu clippings. 39. From sulphuric acid and powdered charcoal. — Char-coal reduces sulphuric acid, with the formation of varyingamounts of sulphur dioxide, carbon monoxide and dioxide. The impure gas may be made by heating a thin paste ofpowdered charcoal and concentrated sulphuric acid in a
Size: 1424px × 1754px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectchemist, bookyear1901
