Chemical lecture experiments . oride solution,the hydrogen flame will be sufficiently colored to be seen ata distance. 2H20=2H2 + 02. Hoffmann electrolytic apparatus (Fig. 46, p. 95); four cells bichro-mate battery ; 10 per cent H2S04. (b) The decomposition of acidulated water by the electriccurrent may be much more simply effected by using the 74 CHEMICAL LECTURE EXPERIMENTS apparatus shown in Fig. 36. The electrodes of this appa-ratus are prepared by sealing a short piece of platinumwire fastened to a piece of platinum foil into a drawn-out tube bent in the form of ahook. The tube is then fi
Chemical lecture experiments . oride solution,the hydrogen flame will be sufficiently colored to be seen ata distance. 2H20=2H2 + 02. Hoffmann electrolytic apparatus (Fig. 46, p. 95); four cells bichro-mate battery ; 10 per cent H2S04. (b) The decomposition of acidulated water by the electriccurrent may be much more simply effected by using the 74 CHEMICAL LECTURE EXPERIMENTS apparatus shown in Fig. 36. The electrodes of this appa-ratus are prepared by sealing a short piece of platinumwire fastened to a piece of platinum foil into a drawn-out tube bent in the form of ahook. The tube is then filledwith mercury, and the con-nections are made by thrust-ing the lead wires from abattery into the mercury inthe tube. Two glass cylin-ders of equal diameter arefilled with the acidulatedwater and inverted over electrodes may be still further simplified by fasten-ing pieces of platinum foil to rubber-covered copper is necessary in this case, however, to cover with paraffinall parts of exposed Fig. 36 HYDROGEN PEROXIDE FORMATION AND PREPARATION 35. By cooling a jet of burning hydrogen. — When aflame of burning hydrogen is suddenly cooled, small quanti-ties of hydrogen peroxide are formed. Hydrogen obtained from the action of zinc on dilute sul-phuric acid is allowed to burn from a glass jet, 3 or 4 diameter, directed downwards uponwater in a porcelain evaporating dish,which has a few pieces of ice floatingin it. Two or three drops of dilutesulphuric acid should be added tothe water in the dish. The jet flame is so played on thesurface of the water as to cool about one-half of it, and ig ^
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