The total concentration of phosphate ions in an aqueous solution of magnesium phosphate is 4.2 M.
The balanced chemical equation for the reaction of dissociation of magnesium phosphate in water:
Mg₃(PO₄)₂(aq) → 3Mg²⁺ (aq) + 2PO₄³⁻ (aq)
From the balanced chemical equation of dissociation of magnesium phosphate: n(Mg₃(PO₄)₂) : n(PO₄³⁻) = 1 : 2
There are two phosphate ions in one molecule of magnesium phosphate.
c(Mg₃(PO₄)₂) = 2.1 M; the concentration of magnesium phosphate
c(PO₄³⁻) = c(Mg₃(PO₄)₂) × 2
c(PO₄³⁻) = 2.1 M × 2
c(PO₄³⁻) = 4.2 M; the total concentration of phosphate ions in an aqueous solution of magnesium phosphate
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