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

  1. Detailed information about the equation 2HNO3 + Ni -> 2NO2 + 2H2O + Ni(NO3)2:

    • This is a redox reaction. In that, nickel (Ni) is oxidized from an oxidation state of 0 to +2 and nitrogen in HNO3 is reduced from an oxidation state of +5 to +4 in NO2.
    • In terms of material balance, the equation shows that every 2 moles of concentrated nitric acid (HNO3) react with 1 mole of nickel (Ni) to produce 2 moles of nitrogen dioxide (NO2), 2 moles of water (H2O), and 1 mole of nickel nitrate (Ni(NO3)2).

  2. Reaction conditions:

    • The condition for the reaction to occur is the presence of nitric acid and nickel, appropriate temperature and pressure.
    • If using concentrated nitric acid, a higher temperature condition may be needed to enhance the reaction.

  3. Reaction process:

    • Nickel reacts with concentrated nitric acid to form nickel nitrate, nitrogen dioxide and water. In this process, nickel is oxidized and nitrogen in nitric acid is reduced.

  4. Observed phenomena:

    • During the reaction process, the color change of the solution can be observed due to the formation of nickel nitrate and nitrogen dioxide.
    • The reaction also releases heat and brown NO2 gas.

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