Question

what is the correct formula that would result from the combination of the two ionic species?
mg²+ and po₄³-
mg₃(po₄)₂
mg(po₄)₃
mgpo₄
mg₂(po₄)₂

Explanation:

Step1: Determine charge balance

In an ionic compound, the total positive charge equals the total negative charge. Let the formula be \(Mg_x(PO_4)_y\). The charge on \(Mg^{2 + }\) is \(+ 2\) and on \(PO_4^{3 - }\) is \(-3\). So, \(2x-3y = 0\).

Step2: Solve for \(x\) and \(y\)

From \(2x-3y = 0\), we get \(x=\frac{3y}{2}\). When \(y = 2\), \(x = 3\).

Answer:

\(Mg_3(PO_4)_2\)