Question

Write the balanced complete ionic equations and net ionic equations for the reactions that occur when each of the following solutions are mixed. (Type your answers using the format [NH4]+ for NH4+ or Ca3(PO4)2 for Ca3(PO4)2. Use the lowest possible coefficients.)

(a) Pb(NO3)2(aq) and Na2S(aq)

complete ionic equation: (aq) + S2-(aq) + Pb2+(aq) + NO3-(aq) (s) + Na+(aq) + (aq)

net ionic equation: Pb2+(aq) + (aq) (s)

(b) Fe2(SO4)3(aq) and CaCl2(aq)

complete ionic equation: (aq) + SO42-(aq) + Ca2+(aq) + Cl-(aq) (s) + Fe3+(aq) + (aq)

net ionic equation: Ca2+(aq) + (aq) (s)

(c) Cr2(SO4)3(aq) and (NH4)2CO3(aq)

complete ionic equation: (aq) + CO32-(aq) + Cr3+(aq) + SO42-(aq) (s) + NH4+(aq) + (aq)

net ionic equation: Cr3+(aq) + (aq) (s)

Answer 1

(a) Pb(NO3)2(aq) and Na2S(aq)

     Pb(NO3)2(aq) + Na2S(aq)-------------> PbS(s) + 2NaNO3(aq)

Pb⁺²(aq) +2(NO3)^-(aq) + 2Na⁺(aq)+S^-2(aq)-------------> PbS(s) + 2Na⁺(aq) +2NO3^-(aq)

removal of spectetor ions to get net ionic equation

Pb⁺²(aq) +S^-2(aq)-------------> PbS(s) net ionic reaction

(b) Fe2(SO4)3(aq) and CaCl2(aq)

       Fe2(sO4)3 (aq) + 3CaCl2(aq) ----------------> 3CaSo4(s) + 2FeCl3(aq)

      2Fe⁺²(aq) +3(sO4)^- (aq) + 3Ca⁺²+6Cl^-(aq) ----------------> 3CaSo4(s) + 2Fe⁺²(aq)+6Cl^-(aq)

   removal of spector ions to get net ionic equation

3(sO4)^- (aq) + 3Ca⁺² ----------------> 3CaSo4(s) net ionic equation

(c) Cr2(SO4)3(aq) and (NH4)2CO3(aq)

   Cr2(SO4)3(aq) + (NH4)2CO3(aq)---------------> Cr2(CO3)3(s) + (NH4)2SO4(aq)

2Cr⁺³(aq) +3(SO4)^2-(aq) + 2(NH4)⁺(aq) +CO3^2-(aq)---------------> Cr2(CO3)3(s) + 2(NH4)⁺(aq) +SO4^2-(aq)

removal of spectetor ions to get net ionic equation

2Cr⁺³(aq) +CO3^2-(aq)---------------> Cr2(CO3)3(s) net ionic equation