When an acid and an alkali or base neutralize each other, the products formed are salt and water.

Here's a breakdown:

* Acid: A substance that releases hydrogen ions (H+) when dissolved in water.

* Alkali/Base: A substance that releases hydroxide ions (OH-) when dissolved in water.

When they react:

* H+ (from acid) + OH- (from alkali/base) → H2O (water)

* The remaining ions from the acid and base combine to form a salt.

Example:

* HCl (hydrochloric acid) + NaOH (sodium hydroxide) → NaCl (sodium chloride) + H2O (water)

Here, sodium chloride (NaCl) is the salt formed.

Important note: The salt formed may be acidic, basic, or neutral depending on the strength of the acid and base involved.