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| Methods of Preparation of Bases |
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| Some bases can be prepared by the direct combination of a metal with oxygen. For e.g., |
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Metal + Oxygen  Basic oxide |
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| The thermal decomposition of metal carbonates produces basic oxides and carbon dioxide. |
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| Metal carbonate Basic oxide + Carbon dioxide |
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| The thermal decomposition of metal nitrates produces basic oxides, nitrogen dioxide and oxygen. |
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| Metal nitrate Basic oxide + Nitrogen dioxide + Oxygen |
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| Certain basic hydroxides can be obtained through precipitation of the hydroxides, by treating aqueous solutions of certain salts, with other stronger bases. |
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| Some active metals react spontaneously with water to form their respective bases. |
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| When basic oxides dissolve in water they associate with hydroxyl ions to form bases. |
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