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

  1. The chemical equation above represents the reaction process between nitric acid (HNO3) and zinc metal (Zn) to produce nitrogen dioxide gas (NO2), water (H2O), and zinc nitrate (Zn(NO3)2).

  2. Reaction conditions: For the reaction to occur, sufficient energy is needed to stimulate the reaction. Specific conditions may vary depending on each specific case, but it usually requires appropriate temperature and pressure.

  3. Reaction process: When nitric acid and zinc are combined, nitric acid molecules will attack the surface of the zinc, producing nitrogen dioxide gas, water, and zinc nitrate. This process continues until one of the two reactants is exhausted or equilibrium is reached.

  4. Phenomena occurring: During the reaction process, bubbles of gas (which is the nitrogen dioxide being produced) can be observed from the surface of the zinc. At the same time, the solution will become transparent as zinc nitrate dissolves in water.

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