South Pasadena • Honors Chemistry
Name
5 • Chemical Reactions
Period
5.2
PROBLEMS
–
Date
REACTIONS IN AQUEOUS
SOLUTION
1. For each of the following sets of reactants, write the balanced molecular equation. (Be sure to write the ions
first!) Then write the net ionic equation.
(a) Solutions of sodium sulfate and barium chloride are combined.
Na2SO4 (aq) + BaCl2 (aq)  2 NaCl (aq) + BaSO4 (s)
Ba2+ (aq) + SO42‒ (aq)  BaSO4 (s)
(b) Solutions of calcium acetate and potassium sulfate are combined.
Ca(C2H3O2)2 (aq) + K2SO4 (aq)  2 KC2H3O2 (aq) + CaSO4 (s)
Ca2+ + SO42‒ (aq)  CaSO4 (s)
(c) Solutions of hydrochloric acid and sodium sulfite are combined.
2 HCl (aq) + Na2SO3 (aq)  H2O (ℓ) + SO2 (g) + 2 NaCl (aq)
2 H+ (aq) + SO32‒ (aq)  H2O (ℓ) + SO2 (g)
(d) Solutions of nitric acid and calcium hydroxide are combined.
2 HNO3 (aq) + Ca(OH)2 (aq)  Ca(NO3)2 (aq) + 2 H2O (ℓ)
H+ (aq) + OH‒ (aq)  H2O (ℓ)
(e) Solutions of lead nitrate and lithium iodide are combined.
Pb(NO3)2 (aq) + 2 LiI (aq)  PbI2 (s) + 2 LiNO3 (aq)
Pb2+ (aq) + 2 I‒ (aq)  PbI2 (s)
(f) Solutions of silver fluoride and magnesium chloride are combined.
2 AgF (aq) + MgCl2 (aq)  MgF2 (s) + 2 AgCl (s)
2 Ag+ (aq) + 2 F‒ (aq) + Mg2+ (aq) + 2 Cl‒ (aq)  MgF2 (s) + 2 AgCl (s)
(g) Solutions of ammonium chloride and barium hydroxide are combined.
2 NH4Cl (aq) + Ba(OH)2 (aq)  2 NH3 (g) + 2 H2O (ℓ) + Ba2+ (aq) + 2 Cl‒ (aq)
NH4+ (aq) + OH‒ (aq)  NH3 (g) + H2O (ℓ)
(h) Solutions of silver nitrate and potassium chromate are combined.
2 AgNO3 (aq) + K2CrO4 (aq)  Ag2CrO4 (s) + 2 KNO3 (aq)
2 Ag+ (aq) + CrO42‒ (aq)  Ag2CrO4 (s)
(i) Solutions of sulfuric acid and potassium hydroxide are combined.
H2SO4 (aq) + 2 KOH (aq)  K2SO4 (aq) + 2 H2O (ℓ)
H+ (aq) + OH‒ (aq)  H2O (ℓ)
(j) Sodium acetate is dissolved in water. (Hint: write water as HOH.)
NaC2H3O2 (aq) + H2O (ℓ)  NaOH (aq) + HC2H3O2 (aq)
C2H3O2‒ (aq) + H2O (ℓ)  OH‒ (aq) + HC2H3O2 (aq)
2. For each of the following sets of reactants, write the balanced molecular equation. (Be sure to write the ions
first!) Then write the net ionic equation.
(a) KOH (aq) + AlBr3 (aq)
3 KOH (aq) + AlBr3 (aq)  Al(OH)3 (s) + 3 KBr (aq)
3 OH‒ (aq) + Al3+ (aq)  Al(OH)3 (s)
(b) HCl (aq) + NaOH (aq)
HCl (aq) + NaOH (aq)  H2O (ℓ) + NaCl (aq)
H+ (aq) + OH‒ (aq)  H2O (ℓ)
(c) H3PO4 (aq) + CaBr2 (aq)
2 H3PO4 (aq) + 3 CaBr2 (aq)  Ca3(PO4)2 + 6 HBr (aq)
3 Ca2+ (aq) + 2 PO43‒  Ca3(PO4)2 (aq)
(d) Pb(NO3)2 (aq) + K2SO4 (aq)
Pb(NO3)2 (aq) + K2SO4 (aq)  2 KNO3 (aq) + PbSO4 (s)
Pb2+ (aq) + SO42‒ (aq)  PbSO4 (s)
(e) CaCO3 (s) + HNO3 (aq)
CaCO3 (s) + 2 HNO3 (aq)  H2O (ℓ) + CO2 (g) + Ca(NO3)2 (aq)
CaCO3 (s) + 2 H+ (aq)  H2O (ℓ) + CO2 (g) + Ca2+ (aq)
(f) CsOH (s) + HC2H3O2 (aq)
CsOH (s) + HC2H3O2 (aq)  CsC2H3O2 (aq) + H2O (ℓ)
CsOH (s) + HC2H3O2 (aq)  Cs+ (aq) + C2H3O2‒ (aq) + H2O (ℓ)
(g) AgClO3 (aq) + BaI2 (aq)
2 AgClO3 (aq) + BaI2 (aq)  2 AgI (s) + Ba(ClO3)2 (aq)
Ag+ (aq) + I‒ (aq)  AgI (s)
(h) Pb(C2H3O2)2 (aq) + HCl (aq)
Pb(C2H3O2)2 (aq) + 2 HCl (aq)  HC2H3O2 (aq) + PbCl2 (s)
Pb2+ (aq) + 2 C2H3O2‒ (aq) + 2 H+ (aq) + 2 Cl‒ (aq)  2 HC2H3O2 (aq) + PbCl2 (s)
(i) K2CrO4 (aq) + Ca(NO3)2 (aq)
K2CrO4 (aq) + Ca(NO3)2 (aq)  2 KNO3 (aq) + CaCrO4 (s)
CrO42‒ (aq) + Ca2+ (aq)  CaCrO4 (s)
(j) (NH4)2S (s) + H2O (ℓ)
(NH4)2S (s) + 2 H2O (ℓ)  2 NH3 (g) + 2 H2O (ℓ) + H2S (g)
(NH4)2S (s) + 2 H2O (ℓ)  2 NH3 (g) + 2 H2O (ℓ) + H2S (g)