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| Summary |
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 A base is a substance that combines with an acid to form salt and water. |
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An alkali is a base that has hydroxyl radical (OH-) and is soluble in water. |
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| Examples: NaOH and KOH. |
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Alkalis react with aqueous solutions of metal salts producing the precipitates of respective metal hydroxides. |
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Certain metals like zinc, lead and aluminium react with concentrated hydroxide to produce salt and hydrogen. |
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Certain metal oxides like of zinc, lead and aluminium dissolve both in acid or alkali to yield salt and water. They are known as amphoteric substances. |
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Action of Alkalis on Substances
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