The chemical formula for Copper II dihydrogen phosphate is Cu(H₂PO₄)₂. Here's how to break it down:

* Copper II: This tells us the copper ion has a +2 charge (Cu²⁺).

* Dihydrogen phosphate: This is the polyatomic ion H₂PO₄⁻, with a -1 charge.

* Balancing the charges: We need two dihydrogen phosphate ions (2 x -1 = -2) to balance the +2 charge of the copper ion.

Therefore, the final formula is Cu(H₂PO₄)₂.