The equation 4HNO3 + Ca(OH)2 -> 2NO2 + 2H2O + Ca(NO3)2

  1. The chemical equation above describes the reaction between nitric acid (HNO3) and calcium hydroxide (Ca(OH)2) to produce nitrogen dioxide (NO2), water (H2O), and calcium nitrate (Ca(NO3)2).

  2. Reaction conditions: This reaction occurs under standard temperature and pressure conditions and does not require a catalyst.

  3. Reaction process:

    • Step 1: 4 molecules of nitric acid (HNO3) react with 1 molecule of calcium hydroxide (Ca(OH)2).
    • Step 2: The result of the reaction produces 2 molecules of nitrogen dioxide (NO2), 2 molecules of water (H2O), and 1 molecule of calcium nitrate (Ca(NO3)2).

  4. Phenomenon observed: As the reaction takes place, one can observe a color change in the solution due to the appearance of nitrogen dioxide (NO2) – a reddish-orange gas. Also, the solution will transition from the strong base state of calcium hydroxide (Ca(OH)2) to a neutral state due to the formation of calcium nitrate (Ca(NO3)2) and water (H2O).

Leave a Comment