What does the 2 mean in the formula 5Mg3(PO4)2?
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Answer:2 x phosphate.
Explanation: the 2 behind the (PO4) 2 denotes that there are two (PO4) in the substance. Mg has a charge of 2+, and that will mean the 3 Mg will have a total charge of 6+. This will need 2 phosphate(PO4) ions to balance the charges, which gives a charge of 6- in total.
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