You would need a mortar and pestle to convert the clumps of copper II sulfate into a usable powder form.

Here's why:

* Mortar and Pestle: This tool is designed specifically for grinding and crushing solid materials into a fine powder. The mortar is a bowl-shaped container, and the pestle is a heavy object used to grind the material against the mortar's inner surface.

Let me know if you have any other questions!