* Acid Salt Formation: Acid salts are formed when a polyprotic acid (an acid with more than one ionizable hydrogen) reacts with a base, but the acid doesn't completely neutralize all of its acidic hydrogens.

* Phosphoric Acid (H₃PO₄): Phosphoric acid (H₃PO₄) is a triprotic acid, meaning it has three ionizable hydrogens.

* Sodium Dihydrogen Phosphate (NaH₂PO₄): When one of the acidic hydrogens in phosphoric acid is replaced by a sodium ion (Na+), we get NaH₂PO₄. This compound still retains two acidic hydrogens, making it an acidic salt.

* Behavior in Solution: In solution, NaH₂PO₄ will release hydrogen ions (H+), making the solution slightly acidic.

Let me know if you'd like more details on acid salts and their properties!