Pb3(PO4)2 i just answered it on castlelearning.com and it was correct
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The formula for cupric hypophosphite is Cu(H2PO2)2.
The chemical formula for dioxygen diphosphorus, which is commonly written as PO2, is P2O4.
When sodium hypophosphite reacts with copper sulfate, it forms copper hypophosphite and sodium sulfate. The balanced chemical equation for this reaction is: 3CuSO4 + 2NaH2PO2 → Cu3(P2O6)2 + 2Na2SO4.
Lead (II) bisulfate has the formula Pb(HSO4)2
Pb(ClO3)4