Which of the following is the correct molecular formula for magnesium phosphate tribasic?

  1. (Mg(H2PO4)2)
  2. Mg3(PO4)2
  3. Mg(PO4)2
  4. (MgHPO4)
Explanation

Answer: B - Mg3(PO4)2

Phosphate is a polyatomic anion with the molecular formula PO43-, and magnesium typically takes an oxidation state of +2. The simplest way to balance these charges gives the correct molecular formula, Mg3(PO4)2.

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