The chemical equation 6HNO3 + 2CuS -> 4NO2 + 2H2O + 2Cu(NO3)2 + S

  1. Detailed information about the equation 6HNO3 + 2CuS -> 4NO2 + 2H2O + 2Cu(NO3)2 + S: This equation describes a chemical reaction between nitric acid (HNO3) and copper sulfide (CuS). The result of this reaction is the production of nitrogen dioxide (NO2), water (H2O), copper(II) nitrate (Cu(NO3)2) and sulfur (S).

  2. Reaction conditions: This reaction requires an acidic environment, suitable temperature and pressure to occur.

  3. Reaction process: CuS reacts with HNO3 to produce NO2, H2O, Cu(NO3)2 and S. Sulfur is oxidized from state -2 in CuS to state 0 in S. The Nitrogen atom in HNO3 is reduced from state +5 to +4 in NO2.

  4. Phenomena: When the reaction occurs, changes in substance mass, color and temperature can be observed. Specifically, during the reaction process, sulfur is released in a yellow color, while brown-red nitrogen dioxide gas is also produced.

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