When solutions of KCl and Pb(NO₃)₂ are mixed, a precipitate forms. Which of the following is the balanced equation for the double replacement reaction that occurs? A)KCl(aq)+ Pb(NO₃)₂(aq)→ KNO₃(aq)+ PbCl₂(s) B)KNO₃(aq)+ PbCl₂(s)→ KCl(aq)+ Pb(NO₃)2(aq) C)K+(aq)+ NO₃^-(aq) → KNO₃(aq) D)2KCl (aq)+ Pb(NO₃)₂(aq)→ 2KNO₃(aq)+ PbCl₂(s) E)KCl(aq)+ Pb(NO₃)₂(aq)→ KNO₃(aq)+ PbCl(s)

Question

Quizplus · Accepted Answer

In a double replacement reaction, the cations and anions of the reactants switch partners to form two new compounds. In this case, K+ from KCl and Pb2+ from Pb(NO3)2 switch partners to form K+Pb2+ and Cl-NO3-. Since PbCl2 is insoluble, it forms a solid precipitate in the reaction. The balanced equation is 2KCl(aq) + Pb(NO3)2(aq) → 2KNO3(aq) + PbCl2(s).

When Solutions of KCl and Pb(NO₃)₂ Are Mixed, a Precipitate