The balanced chemical equation for the reaction between potassium hydroxide (KOH) and nitric acid (HNO3) is:

KOH(aq) + HNO3(aq) → KNO3(aq) + H2O(l)

In this reaction, potassium hydroxide and nitric acid react to form potassium nitrate (KNO3) and water (H2O). The reaction is a neutralization reaction, in which an acid and a base react to form a salt and water.