The reaction of phosphoric acid (H₃PO₄) with potassium hydroxide (KOH) is a neutralization reaction, producing potassium phosphate (K₃PO₄) and water (H₂O). Here's the balanced chemical equation:

H₃PO₄ (aq) + 3KOH (aq) → K₃PO₄ (aq) + 3H₂O (l)

Explanation:

* Phosphoric acid (H₃PO₄): A triprotic acid, meaning it can donate three protons (H⁺ ions).

* Potassium hydroxide (KOH): A strong base that provides hydroxide ions (OH⁻).

* Potassium phosphate (K₃PO₄): A salt formed by the reaction of the acid and base.

* Water (H₂O): A byproduct of the neutralization reaction.

Mechanism:

The reaction occurs in steps as the acid donates its protons to the base.

1. H₃PO₄ + KOH → KH₂PO₄ + H₂O

2. KH₂PO₄ + KOH → K₂HPO₄ + H₂O

3. K₂HPO₄ + KOH → K₃PO₄ + H₂O

Overall:

The reaction is exothermic, meaning it releases heat. The final solution will contain potassium phosphate dissolved in water.