The equation CuSO4 + K2S -> CuS + K2SO4

Detailed information about the chemical equation: The chemical equation refers to the formation of copper(I) sulfide (CuS) and potassium sulfate (K₂SO₄) from the reaction between copper(II) sulfate (CuSO₄) and potassium sulfide (K₂S).

Reaction conditions: The standard conditions for this reaction require appropriate temperature and pressure. The temperature usually ranges from 25 to 30 degrees Celsius, while the pressure must be 1 atm. This reaction also requires the presence of a solvent such as water to occur.

Reaction process: When CuSO₄ and K₂S are mixed together in an appropriate solvent (such as water), they will react to form CuS and K₂SO₄. CuS will then settle at the bottom of the reaction vessel, while K₂SO₄ will remain in the solution.

Phenomenon occurrence: When the reaction occurs, the color of the solution will change. The initial solution is blue due to CuSO₄, but after the reaction, the color will change to the black of CuS. At the same time, the amount of solids settling at the bottom of the reaction vessel also indicates the occurrence of the reaction.