Which formula represents copper(II) phosphate?
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Regents Chemistry June 2026
33 Which formula represents copper(II) phosphate?
(1) Cu2PO4
(2) Cu3PO4
(3) Cu2(PO4)3
(4) Cu3(PO4)2
Solution:
Copper(II)phosphate is an ionic compound because it consists of a metal (to the left of the staircase on the Periodic table) and a polyatomic ion which can be found in table E on the Reference Table. Copper(II) is Cu²⁺. Phosphate is PO₄³⁻. We cross-multiply the oxidation numbers to determine subscripts in the formula. Cu gets a 3 from phosphate and phosphate gets a 2 from Cu. We get Cu₃(PO₄)₂, choice 4.
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