Identify the correct formula for the compound formed between Mg²⁺ and PO₄³⁻ ions.
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A.
MgPO₄
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B.
Mg₃(PO₄)₂
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C.
Mg₂(PO₄)₃
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D.
Mg(PO₄)₃
Correct Answer:
B. Mg₃(PO₄)₂
Explanation:
The correct formula for the compound formed between magnesium ions (Mg²⁺) and phosphate ions (PO₄³⁻) is Mg₃(PO₄)₂. This is determined using the criss-cross method to ensure the resulting ionic compound is electrically neutral. Since magnesium has a +2 charge and phosphate has a -3 charge, three magnesium ions (totaling +6) are required to balance two phosphate ions (totaling -6), achieving a net charge of zero.
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