Question
What is the difference between : An alkali and a base?

Answer

The difference between an alkali and a base is:
An alkali Base
An alkali is a basic hydroxide which when dissolved in water produces hydroxyl ($OH^-$) ions as the only negatively charged ions. A base is defined as a chemical compound which when reacts with hydronium ion or$ H^+$​​​​​​​ ions furnished by an acid form salt and water only.
All alkalis are water soluble. Bases may or may not be water soluble.
Examples are $NaOH, KOH, Ca(OH)_{2.}​​​​​​​$ Examples are $CuO, Mg(OH)_{2.}​​​​​​​$

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