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

  1. Detailed information about the chemical equation:

    • CuS is the chemical formula for Copper (I) sulfide, a black solid that is insoluble in water.
    • HNO3 is the chemical formula for Nitric Acid, a strong acid with a pale yellow color, easily oxidized to Nitrogen Oxide gas.
    • Cu(NO3)2 is the chemical formula for Copper (II) Nitrate, a compound with a blue color.
    • H2O is the chemical formula for water.
    • NO2 is the chemical formula for Nitrogen Dioxide, a reddish-brown gas with a distinctive smell.
    • S is the chemical formula for Sulfur, a yellow chemical element.

  2. Reaction conditions:

    • For the reaction to take place, CuS needs to be introduced into the acidic environment of HNO3.

  3. Reaction process:

    • During the reaction process, Copper (I) sulfide (CuS) reacts with Nitric Acid (HNO3) to produce Copper (II) Nitrate (Cu(NO3)2), water (H2O), Nitrogen Dioxide (NO2), and sulfur (S).

  4. Occurring phenomena:

    • During the reaction process, we can observe the color change from the black of CuS to the blue of Cu(NO3)2.
    • In addition, Nitrogen Dioxide gas (NO2) will be released and can be seen as a reddish-brown smoke.
    • Sulfur (S) will also be created as a by-product.

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