Question

select the correct answer. give the name and formula of the compound formed when a mn²⁺ cation combines with a (po4)³⁻ anion. a. manganese phosphate: mn₃(po₄)₂ b. magnesium phosphate: mn₂(po₄)₃ c. manganese sulfate: mn₂(po₄)₃ d. magnesium sulfate: mn₃(po₄)₂ e. manganese oxalate: mn₂(po₄)³

Explanation:

Step1: Identify the cation and anion

The cation is $Mn^{2 +}$ (manganese - 2 ion) and the anion is $(PO_{4})^{3-}$ (phosphate ion).

Step2: Determine the formula using charge - balance

To balance the charges, we need 3 $Mn^{2+}$ ions (total positive charge = $3\times2=6$) and 2 $(PO_{4})^{3 -}$ ions (total negative charge = $2\times3 = 6$). So the formula is $Mn_{3}(PO_{4})_{2}$. The name of the compound is manganese phosphate.

Answer:

A. manganese phosphate: $Mn_{3}(PO_{4})_{2}$