Question

Write the balanced molecular, total ionic, and net ionic equations for the following metathesis in which transition metal precipitates form in both cases. Identify spectator ions as well.

A. lead II nitrate + lithium sulfide—>

B. lithium phosphate + zinc (II) chloride—->

Answer 1

A.

Molecular equation :

Pb(NO₃)₂ (aq) + Li₂S (aq) $\to$ PbS (s) + 2 LiNO₃ (aq)

Ionic equation :

Pb²⁺ (aq) + 2 NO₃^- (aq) + 2 Li⁺ (aq) + S^-2 (aq) $\to$ PbS (s) + 2 Li⁺ (aq) + 2 NO₃^- (aq)

Net ionic equation :

Pb²⁺ (aq) + S^2- (aq) $\to$ PbS (s)

Spectator ions : NO₃^- , Li⁺,

B.

2 Li₃(PO₄) (aq) + 3 ZnCl₂ (aq)   $\to$ Zn₃(PO₄)₂ (s) + 6 LiCl (aq)

Ionic equation

6 Li⁺ (aq) + 2 PO₄^3- (aq) + 3 Zn²⁺ (aq) + 6 Cl^- (aq)   $\to$ Zn₃(PO₄)₂ (s)  + 6 Li⁺ (aq) + 6 Cl ^- (aq)

Net ionic equation :

3 Zn²⁺ (aq) + 2 PO₄^3- (aq) $\to$ Zn₃(PO₄)₂ (s).

Spectator ion : Li⁺ , Cl^-