Calculate the mass of copper sulfate needed to prepare 2 dm^3 0.25 M CuPO4 solution?

Answer from: Eugene Z.:
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2*0.25 = 0.5 (mol) - the amount of copper phosphate in solution (and therefore the copper ions themselves).
Copper sulfate also needs 0.5 mole, or 0.5*160 = 80 g.

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