Copper oxalate (CuC₂O₄) is generally insoluble in water but can dissolve in solutions that contain strong acids or bases. Specifically, it may dissolve in:
1. **Strong Acids**: It is soluble in dilute nitric acid (HNO₃) and hydrochloric acid (HCl), where it can form soluble copper(II) ions and soluble oxalate ions (like oxalic acid, H₂C₂O₄).
2. **Strong Bases**: Copper oxalate can also dissolve in concentrated solutions of sodium