why potassium hydroxide do not react with sodium sulfate

Question

why warm potassium hydroxide do not react with sodium

why it react with aluminium oxide?Alkali can react with base?

Answer 1

Look at the net ionic equations for each reaction.  You'll notice that potassium hydroxide (KOH) and sodium sulfate (Na2SO4) produce all soluble salts/ions and there is no net ionic equation, i.e. NO REACTION.  If you look at the reaction of aluminum oxide, you must recognize that aluminum oxide is insoluble in water and so appears as a solid in the net ionic equation.  Al₂O₃ is also amphotheric (acts as an acid or a base) so it can act as an acid and react with the KOH, a base.  The reaction is not a simple one, and the product is an aluminate, or more specifically potassium tetrahydroxyaluminate.

Finally, I have no idea what you mean when you say alkali can react with base?  Alkali is a base.