The equation 4HNO3 + NiO -> 2NO2 + 2H2O + Ni(NO3)2

  1. The chemical equation above describes the reaction process between Nitric Acid (HNO3) and Nickel(II) Oxide (NiO), resulting in Nitrogen Dioxide (NO2), water (H2O), and Nickel(II) Nitrate (Ni(NO3)2).

  2. Reaction conditions:
    This reaction occurs when Nitric Acid reacts with Nickel(II) Oxide at room temperature.

  3. Reaction process:

    • Step 1: Nitric Acid (HNO3) reacts with Nickel(II) Oxide (NiO) to produce Nickel(II) Nitrate (Ni(NO3)2) and water (H2O).
    • Step 2: Nitric Acid continues to react with Nickel(II) Nitrate to create Nitrogen Dioxide (NO2), water (H2O), and more Nickel(II) Nitrate.

  4. Occurring phenomenon:
    When Nitric Acid reacts with Nickel(II) Oxide, it forms a green solution of Nickel(II) Nitrate and releases brown Nitrogen Dioxide gas. This solution also contains water formed from the reaction.

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