Question

Is an alkali also a base?​

Answer 1

Bases vs Alkali

Bases are substances that react with acids and neutralise them. They are usually metal oxides, metal hydroxides, metal carbonates or metal hydrogen carbonates. Many bases are insoluble - they do not dissolve in water.

If a base does dissolve in water, we call it an alkali.

Here are two examples:

Copper oxide is a base because it will react with acids and neutralise them, but it is not an alkali because it does not dissolve in water.

Sodium hydroxide is a base because it will react with acids and neutralise them. It's also an alkali because it dissolves in water.

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