Bases are any Metal oxide, hydroxide or carbonate, for example copper oxide. What you should know is that all alkalis are bases, every single one, but as the diagram below should explain, not all bases are alkalis.
So what’s the difference between a base and an alkali?
Well an alkali is a soluble base; this means a base that will dissolve in water. You can do a simple experiment to show this. Place Calcium carbonate, Copper oxide and Sodium hydroxide into three separate test tubes, half fill the test tubes with water, observe. What you should see is that only the Sodium Hydroxide dissolves, this means only this one is an Alkali.
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