The equation KHCO3 + HNO3 -> KNO3 + H2O + 2CO2

The above chemical equation represents the reaction process between hydrogen potassium carbonate (KHCO₃) and nitric acid (HNO₃), resulting in the formation of potassium nitrate (KNO₃), water (H₂O), and carbon dioxide (CO₂).

Reaction conditions: The reaction occurs under room temperature conditions and atmospheric pressure. Nitric acid will react with hydrogen potassium carbonate in an acidic environment.

Reaction process: Nitric acid will produce nitrate ions (NO₃-) and hydrogen ions (H+). Hydrogen potassium carbonate will produce potassium ions (K+) and bicarbonate ions (HCO₃-). The H+ ions from nitric acid will react with bicarbonate ions to form water (H₂O) and CO₂, while the K+ ions combine with nitrate ions to form potassium nitrate.

Observed phenomena: During the reaction process, one can observe the escape of CO₂ gas bubbles. If the reaction is carried out in a solution environment, the mixture will effervesce due to the escape of CO₂ gas, and the solution will also become clear as the potassium nitrate dissolves.