Answer Key to Practice Problems on Net Ionic Equations:

 

1. Molecular: AgNO3 (aq) + KCl (aq) AgCl (s) + KNO3 (aq)

 

Total Ionic: Ag+ (aq) + NO3 (aq) + K+ (aq) + Cl (aq) AgCl (s) + K+ (aq)

 

+ NO3 (aq)

 

Net Ionic: Ag+ (aq) + Cl (aq) AgCl (s)

 

2. Molecular: Mg(NO3)2 (aq) + Na2CO3 (aq) MgCO3 (s) + 2 NaNO3 (aq)

 

Total Ionic: Mg2+ (aq) + 2 NO3 (aq) + 2 Na+ (aq) + CO32- (aq) MgCO3 (s) + 2 Na+ (aq)

 

+ 2 NO3 (aq)

 

Net Ionic: Mg2+ (aq) + CO32- (aq) MgCO3 (s)

 

3. Molecular: strontium bromide (aq) + potassium sulfate (aq) strontium sulfate (s) +

 

potassium bromide (aq)

 

 

Molecular: SrBr2 (aq) + K2SO4 (aq) SrSO4 (s) + 2 KBr (aq)

 

Total Ionic: Sr2+ (aq) + 2 Br (aq) + 2 K+ (aq) + SO42- (aq) SrSO4 (s) + 2 K+ (aq)

 

+ 2 Br (aq)

 

Net Ionic: Sr2+ (aq) + SO42- (aq) SrSO4 (s)

 

4. Molecular: manganese(II) chloride (aq) + ammonium carbonate (aq) manganese(II)

 

carbonate (s) + ammonium chloride (aq)

Molecular: MnCl2 (aq) + (NH4)2CO3 (aq) MnCO3 (s) + 2 NH4Cl (aq)

 

Total Ionic: Mn2+ (aq) + 2 Cl (aq) + 2 NH4+ (aq) + CO32- (aq) MnCO3 (s) + 2 NH4+ (aq)

 

2 Cl (aq)

 

Net Ionic: Mn2+ (aq) + CO32- (aq) MnCO3 (s)

 

 

 

 

5. Molecular: chromium(III) nitrate (aq) + iron(II) sulfate (aq) chromium(III) sulfate (aq)

 

+ iron(II) nitrate (aq)

 

Molecular: 2 Cr(NO3)3 (aq) + 3 FeSO4 (aq) 3 Fe(NO3)2 (aq) + Cr2(SO4)3 (aq)

 

Total Ionic: 2 Cr3+ (aq) + 6 NO3 (aq) + 3 Fe2+ (aq) + 3 SO42- (aq) 2 Cr3+ (aq) + 6 NO3 (aq)

 

+ 3 Fe2+ (aq) + 3 SO42- (aq)

 

Net Ionic: No Reaction

 

6. Molecular: K3PO4 (aq) + Al(NO3)3 (aq) AlPO4 (s) + 3 KNO3 (aq)

 

Total Ionic: 3 K+ (aq) + PO43- (aq) + Al3+ (aq) + 3 NO3 (aq) AlPO4 (s) + 3 K+ (aq)

 

3 NO3 (aq)

 

Net Ionic: Al3+ (aq) + PO43- (aq) AlPO4 (s)

 

7. Molecular: BeI2 (aq) + Cu2SO4 (aq) BeSO4 (aq) + 2 CuI (s)

 

Total Ionic: Be2+ (aq) + 2 I (aq) 2 Cu+ (aq) + SO42- (aq) Be2+ (aq) + SO42- (aq) + 2 CuI (s)

 

Net Ionic: 2 Cu2+ (aq) + 2 I (aq) 2 CuI (s)

 

8. Molecular: Ni(NO3)3 (aq) + 3 KBr (aq) NiBr3 (aq) + 3 KNO3 (aq)

 

Total Ionic: Ni3+ (aq) + 3 NO3 (aq) + 3 K+ (aq) + 3 Br (aq) Ni3+ (aq) + 3 NO3 (aq)

 

+ 3 K+ (aq) + 3 Br (aq)

 

Net Ionic: No Reaction

 

9. Molecular: cobalt(III) bromide + potassium sulfide

 

Molecular: 2 CoBr3 (aq) + 3 K2S(aq) Co2S3 (s) + 6 KBr (aq)

 

Total Ionic: 2 Co3+ (aq) + 6 Br (aq) + 6 K+ (aq) + 3 S2- (aq) Co2S3 (s) + 6 K+ (aq)

 

+ 6 Br (aq)

 

Net Ionic: 2 Co3+ (aq) + 3 S2- (aq) Co2S3 (s)

 

 

 

10. Molecular: barium nitrate + ammonium phosphate

 

Molecular: 3 Ba(NO3)2 (aq) + 2 (NH4)3PO4 (aq) Ba3(PO4)2 (s) + 6 NH4NO3 (aq)

 

Total Ionic: 3 Ba2+ (aq) + 6 NO3 (aq) + 6 NH4+ (aq) + PO43- (aq) Ba3(PO4)2 (s)

 

+ 6 NH4+ (aq) + 6 NO3 (aq)

 

Net Ionic: 3 Ba2+(aq) + 2 PO43- (aq) Ba3(PO4)2 (s)

 

11. Molecular: calcium hydroxide + iron(III) chloride

 

Molecular: 3 Ca(OH)2 (aq) + 2 FeCl3 (aq) 3 CaCl2 (aq) + 2 Fe(OH)3 (s)

 

Total Ionic: 3 Ca2+ (aq) + 6 OH (aq) + 2 Fe3+ (aq) + 6 Cl (aq) 3 Ca2+ (aq) + 6 Cl (aq)

 

+ 2 Fe(OH)3 (s)

 

Net Ionic: 2 Fe3+ (aq) + 6 OH (aq) 2 Fe(OH)3 (s) simplifies to:

 

Fe3+ (aq) + 3 OH (aq) Fe(OH)3 (s)

 

12. Molecular: rubidium fluoride + copper(II) sulfate

 

Molecular: 2 RbF (aq) + CuSO4 (aq) Rb2SO4 (aq) + CuF2 (aq)

 

Total Ionic: 2 Rb+ (aq) + 2 F (aq) + Cu2+ (aq) + SO42- (aq) 2 Rb+ (aq) + SO42- (aq)

 

Cu2+ (aq) + 2 F (aq)

 

Net Ionic: No Reaction