. Introduction to inorganic chemistry . pressure equal tothat which it would exert if it were gasified at the same temperature and the volumeof the gas were reduced to that of the solvent in the pure state {Amer. Chem,Jour., July, 1905). CHAPTER XVIII OZONE AND HSTDROGEN PEROXIDE A FBESH, penetrating odor, resembling that of very dilute chlorine,was noticed by van Marum (1785) as being perceptible near an elec-trical machine in operation. Schonbein (1840) showed that the odorwas that of a distinct substance, which he named ozone (Gk. of«v,to smell), and he discovered a number of ways of obtain
. Introduction to inorganic chemistry . pressure equal tothat which it would exert if it were gasified at the same temperature and the volumeof the gas were reduced to that of the solvent in the pure state {Amer. Chem,Jour., July, 1905). CHAPTER XVIII OZONE AND HSTDROGEN PEROXIDE A FBESH, penetrating odor, resembling that of very dilute chlorine,was noticed by van Marum (1785) as being perceptible near an elec-trical machine in operation. Schonbein (1840) showed that the odorwas that of a distinct substance, which he named ozone (Gk. of«v,to smell), and he discovered a number of ways of obtaining It isvery questionable whether there is any ozone in the air, exceptingtemporarily in the immediate neighborhood of a natural or artificialdischarge of electricity. Preparation of Ozone. — The most satisfactory way of prepar-ing ozone (O3) is to allow electric waves to pass through apparatus (Fig. 76) consists of two co-axial glass tubes, between■which the oxygen flows. The waves are generated by connecting an. FlO. 76. outer layer of tinfoil on the outer tube, and an inner layer of tinfoilin the inner tube with the poles of an induction coil. With dry, coldoxygen, about per cent of the gas is easily turned into the best conditions this proportion cannot be much exceeded. Ozone is found in the oxygen generated by electrolysis of dilutesulphuric acid (p. 95). Some of it is produced when sulphuric acidacts upon oxides which, with this reagent, liberate oxygen, ,2BaOj + 2H3SO1 -^ 2BaS0i + 2H2O + 0^. It arises during the slowoxidation of phosphorus by the air, resulting, probably, from the de-composition of unstable, highly oxidized bodies which are formedduring the action. Oxygen containing as much as 15 per cent of itie produced by the interaction of fluorine and water (p. 241). SOO OZONE AND HYDROGEN PEROXIDE 301 Physical Properties of Ozone. — Ozone is a gas of blue boils at — 119°, so that when a mixture of oxygen and
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