Solution X contains 6 ions and 12 ions

CHEMISTRY · Subjective · A Level · Chemistry · Reactions of ions in aqueous solution · Reactions of ions in aqueous solution

Problem

Solution X contains 6 Ca2+\mathrm{Ca^{2+}} ions and 12 Cl−\mathrm{Cl^{-}} ions. Solution Y contains 4 PO43−\mathrm{PO_{4}^{3-}} ions and 12 K+\mathrm{K^{+}} ions. When the solutions are mixed, an insoluble solid comprising 2 formula units of Ca3(PO4)2\mathrm{Ca_{3}(PO_{4})_{2}} forms, while all 12 Cl−\mathrm{Cl^{-}} and 12 K+\mathrm{K^{+}} ions remain in solution. Write the balanced net ionic equation for the formation of the precipitate, and in one sentence justify that both mass and charge are conserved according to the particle counts.

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