A text-book on chemistryFor the use of schools and colleges . A basic protoxide therefore requires oneatom of acid, a sesquioxide three, and a deutoxide two,to form a neutral salt. 2d. The neutral or indifferent oxides contain moreoxygen than the basic, and when heated with acids giveoff the oxygen, a basic oxide resulting. 3d. The metallic acids always contain most may be sesquioxides, deutoxides, teroxides, orquadroxides, and are commonly formed by deflagratingthe metal with nitrate of potassa. Reduction of the Metallic Oxides. Some of the oxides, as those of mercury, silver, and
A text-book on chemistryFor the use of schools and colleges . A basic protoxide therefore requires oneatom of acid, a sesquioxide three, and a deutoxide two,to form a neutral salt. 2d. The neutral or indifferent oxides contain moreoxygen than the basic, and when heated with acids giveoff the oxygen, a basic oxide resulting. 3d. The metallic acids always contain most may be sesquioxides, deutoxides, teroxides, orquadroxides, and are commonly formed by deflagratingthe metal with nitrate of potassa. Reduction of the Metallic Oxides. Some of the oxides, as those of mercury, silver, andgold, may be reduced by heat alone, but the greaternumber require the conjoint action of carbon, which ata high temperature decomposes them, with evolution ofcarbonic oxide. Among powerful reducing agents maybe mentioned the formiates and the cyanide of potas- What was the old division ? What substances do metals yieldwith oxygen? What is the peculiarity of basic oxides; of neutraloxides; of metallic acids? By what processes may metallic oxidesbe reduced ?. 312 THE METALLIC SULPHIDES. sium, the former acting through the affinity of carbonicoxide for oxygen, and the latter through the affinity ofcarbon and potassium conjointly. The deoxidation ofmetals may also be accomplished by reducing agents,such as phosphorous and sulphurous acids, or by the ac-tion of other metals; iron, for instance, will precipitatemetallic copper from its solutions. The Voltaic current affords a powerful means of ef-fecting the reduction of metals. By its aid the alkalineFig. 281. metals were discovered. The electro- type, already described, is an exampleof its action; solutions of metallicsalts are readily decomposed by it. E W^^^B Thusif a §lass Jar> T> Fi9- 281> be di-vided into halves, and a paper dia-phragm, D, be introduced betweenthem, the halves being tightly press-ed together by the ring B B, if thejar be filled with any metallic solution, such as the sul-phate of soda, and the positi
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