The reaction of potassium nitrate (KNO₃) with water (H₂O) is a dissolution reaction, meaning the salt dissolves in the water. This results in the formation of potassium ions (K⁺) and nitrate ions (NO₃⁻) in solution.

Here's the equation:

KNO₃(s) + H₂O(l) → K⁺(aq) + NO₃⁻(aq)

* KNO₃(s): Solid potassium nitrate

* H₂O(l): Liquid water

* K⁺(aq): Potassium ions in aqueous solution

* NO₃⁻(aq): Nitrate ions in aqueous solution

Important note: This is not a chemical reaction where new compounds are formed. It's a physical process of dissolving the salt in water, separating the ions.