CuSO4 (aq) + 2KI (aq) → CuI (s) + 2K2SO4 (aq)
The reaction is a precipitation reaction because a solid product is formed. The precipitate is copper(I) iodide, which is a yellow-orange solid. The other product of the reaction is potassium sulfate, which is a white solid.
The reaction between copper sulfate solution and potassium iodide can be used to test for the presence of copper ions in a solution. If a solution contains copper ions, then a precipitate of copper(I) iodide will form when potassium iodide is added to the solution.
The reaction can also be used to remove copper ions from a solution. If a solution contains copper ions, then potassium iodide can be added to the solution to precipitate the copper ions. The precipitate can then be removed from the solution by filtration.
