. Elements of modern chemistry . s, but by non-luminous or obscure discharges(Andrews and Tait, de Babo).Dry and pure oxygen can be con-verted into ozone in this this conversion only takesplace partially, the ozone formedremaining mixed with a largeexcess of oxygen. A contractiontakes place at the moment theoxygen is transformed into experiments prove thatozone is condensed oxygen (Andrews and Tait, de Babo, Soret).The proportion of ozone formed is increased when the oxygenis At —23°, a mixture of oxygen and ozone, contain-ing per cent, of the latter, may b
. Elements of modern chemistry . s, but by non-luminous or obscure discharges(Andrews and Tait, de Babo).Dry and pure oxygen can be con-verted into ozone in this this conversion only takesplace partially, the ozone formedremaining mixed with a largeexcess of oxygen. A contractiontakes place at the moment theoxygen is transformed into experiments prove thatozone is condensed oxygen (Andrews and Tait, de Babo, Soret).The proportion of ozone formed is increased when the oxygenis At —23°, a mixture of oxygen and ozone, contain-ing per cent, of the latter, may be obtained, under normalatmospheric pressures. (Hautefeuille and Chappuis.) 2. By the electrolysis of water.—When acidulated water isdecomposed by the battery current, the oxygen which is disen-gaged at the positive pole contains small quantities of ozone,and the proportion of the latter may be increased by adding aquantity of sulphuric or chromic acid to the water. 3. During slow oxidation.—Some sticks of cleanly-scraped. Fig. 20. tion of the starch with the iodine set at liberty by the ozone. Accordingto Houzeau, it is preferable to use a delicate, wine-colored litmus-paper,one-half of which is impregnated with potassium iodide. Ozone will changethe color of this half to blue, for, in decomposing the potassium iodide, itforms potassium hydrate, and this restores the blue color to the these conditions, the other half of the paper undergoes no changein color, while it would be colored red by acid vapors, or blue by ammonia. OZONE. 61 phosphorus are introduced into a bottle containing enoughwater to just about half immerse them, and the whole is agi-tated from time to time. In a short time the air in the bottlewill be charged with a small quantity of ozone. According to Schonbein, who observed these facts, ozone isproduced during all slow combustions. Thus, when oil of tur-pentine is exposed to the air under the influence of sunlight,it is slowly oxidized, an
Size: 1219px × 2050px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade18, booksubjectchemistry, bookyear1887
