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