Question

Which chemical equation represents a precipitation reaction? A. Mg(ClO3)2(aq) + 2HCl(aq) → MgCl2(aq) + 2HClO3(aq) B. AlBr3(aq) + 3LiI(aq) → AlI3(aq) + 3LiBr(aq) C. NH4NO3(aq) + HBr(aq) → NH4Br(aq) + HNO3(aq) D. Li2CO3(aq) + FeCl2(aq) → 2LiCl(aq) + FeCO3

Answer 1

Answer is D.

Among the given options, the products of equation A, B and C are aqueous solutions. Those are indicated by using (aq).

The balanced equation for the reaction between Li₂CO₃(aq) and FeCl₂(aq) is Li₂CO₃(aq) + FeCl₂(aq) → 2LiCl(aq) + FeCO₃(s)

LiCl is a salt while FeCO₃ is a Grey/green color precipitate. Hence, option D represents a precipitation reaction.