The equation 8HNO3 + 2FeS -> 2Fe(NO3)3 + 4H2O + 8NO + SO2

  1. Detailed information about the equation 8HNO3 + 2FeS -> 2Fe(NO3)3 + 4H2O + 8NO + SO2:
    The above chemical equation describes the oxidation process of iron (II) sulfide (FeS) by nitric acid (HNO3) to produce iron (III) nitrate (Fe(NO3)3), water (H2O), nitrogen monoxide (NO), and sulfur dioxide (SO2).

  2. Reaction conditions:
    This reaction typically occurs at room temperature or slightly higher. However, to ensure the reaction proceeds completely, the temperature may be increased.

  3. Reaction process:
    In the reaction process, iron (II) sulfide is oxidized by nitric acid to form iron (III) nitrate, water, nitrogen monoxide, and sulfur dioxide.

  4. Phenomena that occur:
    When the reaction occurs, a visible phenomenon is the browning smoke caused by the generated NO gas and the rising steam. Simultaneously, the original red solution of nitric acid gradually turns yellow due to the formation of iron (III) nitrate.

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