. Introduction to inorganic chemistry . Fio, 34. interact vigorously. The metal is placed in a tube in which it can bestrongly heated (Fig. 35^. The steam, generated in a flask, enters at. Fig. 35. one end of the tube, and the hydrogen passes off at the other. Since,at a red heat, all hydroxides, except those of potassium and sodium, HYDEOGEN 99 are decomposed into an oxide of the metal and water, Mg(OH)j^>MgO + HjO, the oxides are formed in this case: Iron gives the magnetic oxide, FegO^. Hence, to make the equation,four unit-weights of oxygen, and therefore four formula-weights ofwater, a
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. Introduction to inorganic chemistry . Fio, 34. interact vigorously. The metal is placed in a tube in which it can bestrongly heated (Fig. 35^. The steam, generated in a flask, enters at. Fig. 35. one end of the tube, and the hydrogen passes off at the other. Since, at a red heat, all hydroxides, except those of potassium and sodium, HYDEOGEN 99 are decomposed into an oxide of the metal and water, Mg(OH)j^>MgO + HjO, the oxides are formed in this case: Iron gives the magnetic oxide, FegO^. Hence, to make the equation, four unit-weights of oxygen, and therefore four formula-weights ofwater, are required: 4H2O + SFe -^ rCjO, -f- 8H. Tests.—The effect of a solution of an acid (p. 93) or an alkali (seeabove) upon litmus solution is an illustration of a chemical test. Inthis case a mere trace of a highly colored body dissolved in waterinteracts with a correspondingly minute trace of the acid or alkaliunder examination. Yet the product has such marked color that itspresence is immediately recognizable. Tests for various kinds ofmaterials are eagerly sought by chemists for use in identifying un-known substances. Any property which is so conspicuous as to beapparent when ve