All alkalis are bases but all bases are not alkalis. Why?

Many bases are insoluble, they do not dissolve in water. If a base does dissolve in water, it is called an Alkali. Bases may either be soluble or insoluble in water. Therefore, all alkalis are bases because they will all neutralize acids, but not all bases are alkalis because not all bases will dissolve in water. An example of an alkali is sodium hydroxide.

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.

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Updated on: 10-Oct-2022

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