Chemical lecture experiments . y filed and rubbed with emery paperbefore the experiment, the positive electrode will be foundto be considerably corroded, while the negative electrodewill appear unacted upon. The disintegration of the posi-tive electrode is further made apparent by the presence ofsmall particles of carbon in the liquid and on the rubberstopper holding the electrode. Electrolytic apparatus (Fig. 46, p. 95), with carbon electrodes ;10 per cent H2SO4; battery. CARBON MONOXIDE PREPARATION 9. From carbon dioxide and carbon. — Carbon dioxide,when passed over heated carbon, becomes re
Chemical lecture experiments . y filed and rubbed with emery paperbefore the experiment, the positive electrode will be foundto be considerably corroded, while the negative electrodewill appear unacted upon. The disintegration of the posi-tive electrode is further made apparent by the presence ofsmall particles of carbon in the liquid and on the rubberstopper holding the electrode. Electrolytic apparatus (Fig. 46, p. 95), with carbon electrodes ;10 per cent H2SO4; battery. CARBON MONOXIDE PREPARATION 9. From carbon dioxide and carbon. — Carbon dioxide,when passed over heated carbon, becomes reduced to car-bon monoxide. Coarsely pulverized charcoal is placed in a 30 cm. lengthof combustion-tubing, and a gentle current of dry carbon CARBON MONOXIDE 297 dioxide is conducted through the tube, which is stronglyheated with a four-tube burner (Fig. 119). The issuing gasis conducted through a U-tube containing soda-lime, andissues through a vertical piece of glass tubing, which serves •Cn ^@»8f^ rpD^=5i K_J m o U>*. Fig. 119 as a jet. The gas issuing from the jet, when ignited, burnswith a blue flame. The gas may be collected in cylindersat the pneumatic trough. A large flame is obtained by fill-ing a liter cylinder with the gas and, after igniting it, pouring water rapidly into the + C = 2 CO. 30 cm. length combustion-tubing; 4-tube burner; liter cylindersoda-lime ; U-tube ; C02 generator ; charcoal. 10. From carbon dioxide and zinc. — Zinc dust at a lowred heat effects the reduction of carbon dioxide to carbonmonoxide. A Jena glass combustion-tube is filled, for about 30 its length, with a layer of zinc dust, over which a currentof carbon dioxide is passed. A cork, carrying a glass elbowwhich serves as a jet, is inserted in the other end of the gradually heating the tube with a four-tube burner,the reduction begins, and soon sufficient carbon monoxide 298 CHEMICAL LECTURE EXPERIMENTS will issue from the jet to be lighted and continue t
Size: 1665px × 1501px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectchemist, bookyear1901
