Clear solutions of Na₃PO₄(aq) and CaCl₂(aq) are mixed

CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions

Problem

Clear solutions of Na₃PO₄(aq) and CaCl₂(aq) are mixed, producing a white solid. Which statement best classifies the chemical change that occurs? (a) It is a complex-ion formation reaction because Ca2+\text{Ca}^{2+} coordinates with phosphate ligands in solution. (b) It is a precipitation reaction because Ca3(PO4)2(s)\text{Ca}_3(\text{PO}_4)_2(s) is insoluble in water. (c) It is an acid–base reaction because the base PO43−\text{PO}_4^{3-} accepts protons from water supplied by Ca2+\text{Ca}^{2+}. (d) It is a redox reaction because Ca2+\text{Ca}^{2+} is reduced to Ca\text{Ca} metal while phosphorus is oxidised.

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