Examples of Ionic and Net-Ionic Reactions

 

Write the ionic and net-ionic reaction (if possible) for the following reactions.

 

1.      Reaction:                         K2S(l) + 2HCl(l) → 2KCl(l) + H2S(g)

 

         Ionic Reaction:                 2K+ + S2- +2H+ +2Cl- → 2K+ + 2Cl- + H2S(g)

 

         Net Ionic Reaction:          2H+ + S2- → H2S(g)

        

        Spectator ions:                  K+, Cl-

 

 

2.     Reaction:                         2Na + 2HBr → 2NaBr + H2(g)

              

        Ionic Reaction:                  2Na + 2H+ + 2Br- → 2Na+ + 2Br- + H2

           

        Net Ionic Reaction:           2Na + 2H+ → 2Na + H2

           

        Spectator ions:                  Br -

 

 

3.        Reaction:                          H2O(l) + SO3(g) → H2SO4(l)

 

        Ionic Reaction:                  Not Possible

 

 

4.        Reaction:                          2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O(l)

 

  Ionic Reaction:                 Not Possible

 

 

5.     Reaction:                          2HI + Sr(OH)2 → SrI2 + 2H2O

           

        Ionic Reaction:                  2H+ + 2I- + Sr2+ + 2OH- → Sr2+ + 2I- + 2H2O

 

        Net Ionic Reaction:           2H+ + 2OH- → 2H2O

 

        Spectator ions:                  Sr2+, I-

 

 

6.     Reaction:                          BaCl2 + K2SO4 → BaSO4 + 2KCl

 

        Ionic Reaction:                  Ba2+ + Cl- + 2K+ + SO42- → BaSO4 + 2K+ + 2Cl-

 

        Net Ionic Reaction:           Ba2+ + SO42- → BaSO4

 

        Spectator ions:                  K+ , Cl-

 

7.     Reaction:                          Mg(NO3)2 + 2KOH → Mg(OH)2 + 2KNO3

 

        Ionic Reaction:                  Mg2+ + 2NO3- + 2K+ + 2OH- → Mg(OH)2 + 2K+ + 2NO3-

           

        Net Ionic Reaction:           Mg2+ + 2OH- → Mg(OH)2

 

        Spectator ions:                  K+ , NO3-

 

 

8.     Reaction:                          Mg(NO3)2 + 2NH3(g) + 2H2O → Mg(OH)2 + 2NH4NO3

 

        Ionic Reaction:                  Mg2+ + 2NO3- + 2NH3 + 2H2O → Mg(OH)2 + 2NH4+ + 2NO3-

 

        Net Ionic Reaction:           Mg2+ + 2NH3 + 2H2O → Mg(OH)2 + 2NH4+

 

        Spectator ions:                  NO3-

 

 

9.     Reaction:                          FeSO4 + 2NaOH → Fe(OH)2 + Na2SO4

 

        Ionic Reaction:                  Fe2+ + SO42- + 2Na+ + 2OH- → Fe(OH)2 + 2Na+ + SO42-

 

        Net Ionic Reaction:           Fe2+ + 2OH- → Fe(OH)2

 

        Spectator ions:                  Na+ , SO42-

 

10.   Reaction:                          NH3(g) + HNO3(l) → NH4NO3(l)

 

        Ionic Reaction:                  NH3(g) + H+ + NO3- → NH4+ + NO3-

 

        Net Ionic Reaction:           NH3(g) + H+ → NH4+

 

        Spectator ions:                  NO3-

 

11.   Reaction:                          KOH + HNO3 → KNO3 + H2O

 

        Ionic Reaction:                  K+ + OH- + H+ + NO3- → K+ + NO3-             + H2O

 

        Net Ionic Reaction:           H+ + OH- → H2O

 

        Spectator ions:                  K+, NO3-

 

 

12.   Reaction:                          Na2CO3 + 2HCl → 2NaCl + H2O + CO2

 

        Ionic Reaction:                  2Na+ + CO32- + 2H+ + 2Cl- → 2Na+ + 2Cl- + H2O + CO2

 

        Net Ionic Reaction:           2H+ + CO32- → H2O + CO2

    

        Spectator ions:                  Na+, Cl-

 

 

13.   Reaction:                          NaHCO3 + HCl → NaCl + H2O + CO2

 

        Ionic Reaction:                  Na+ + HCO3- + H+ + Cl- → Na+ + Cl- + H2O + CO2

 

        Net Ionic Reaction:           H+ + HCO3- → H2O + CO2

 

        Spectator ions:                  Na+, Cl-

 

 

14.   Reaction:                          AgNO3 + NaCl → AgCl + NaNO3

 

        Ionic Reaction:                  Ag+ + NO3- + Na+ + Cl- → AgCl + Na+ + NO3-

 

        Net Ionic Reaction:           Ag+ + Cl- → AgCl

 

        Spectator ions:                  Na+ , NO3-

 

 

15.   Reaction:                          AgNO3 + HCN → AgCN + HNO3

           

            HCN is a weak acid and therefore it cannot be ionized.

 

        Ionic Reaction:                  Ag+ + NO3- + HCN → AgCN + H+ + NO3-

 

        Net Ionic Reaction:           Ag+ + HCN → AgCN + H+

 

        Spectator ions:                  NO3-

 

 

16.   Reaction:                          NaCN + HOH ↔ NaOH + HCN

 

            HCN is a weak acid and cannot be ionized.

            NaOH is a strong base and can be ionized.

 

        Ionic Reaction:                  Na+ + CN- + HOH ↔ Na+ + OH- + HCN

 

        Net-ionic Reaction:           CN- + HOH → OH- + HCN

 

        Spectator Ions:                 Na+