Explanation:
-plants that can absorb copper ions are grown on soil with low grade copper ores.
-the plants are burned and the copper compounds are within the Ash.
-copper ions can be leached from the Ash by adding sulphuric acid, this makes a solution of copper sulphate
-the displacement of scrap iron makes pure copper metals.
The name of the compound K3N is potassium nitride (C).
What are the answer choices
This equation is impossible. NaSO4 is non-existent. Did you mean Na2SO4?