AP Chemistry : Net Ionic Equations

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #1 : Net Ionic Equations

What is the net ionic equation for the reaction that occurs when sodium chloride is mixed with silver nitrate.

Possible Answers:

NaCl (aq) + AgNO3 (aq)  ->  NaNO3 (s) + AgCl (aq)

Na+ (aq) + NO3- (aq) -> NaNO3 (s)

NaCl (aq) + AgNO3 (aq)  ->  NaNO3 (aq) + AgCl (s)

NaCl (aq) + AgNO3 (aq) -> NaNO3 (aq) + AgCl (aq)

Ag+ (aq) + Cl- (aq) -> AgCl (s)

Correct answer:

Ag+ (aq) + Cl- (aq) -> AgCl (s)

Explanation:

Only the Ag and Cl ions are reacting to form solid silver chloride.

Example Question #1 : Net Ionic Equations

What is the net ionic equation that occurs when sodium chloride is mixed with potassium nitrate?

Possible Answers:

NaCl (aq) + KNO3 (aq) -> NaNO3 (aq) + KCl (aq)

Na+ (aq) + NO3- (aq) -> NaNO3 (s)

No Reaction

NaCl (aq) + KNO3 (aq)  ->  NaNO3 (s) + KCl (aq)

NaCl (aq) + KNO3 (aq)  ->  KNO3 (aq) + KCl (s)

Correct answer:

No Reaction

Explanation:

Since no precipitation is predicted by the solubility rules, there will be no reaction.

Example Question #3 : Net Ionic Equations

What is the net ionic reaction when potassium carbonate is mixed with Calcium bromide?

Possible Answers:

2 K2CO3 (aq) + CaBr2 (aq) ->  2 KBr (aq)  +  CaCO3 (s)

2 K+ (aq) + Br- (aq) -> 2 KBr (s)

2 K2CO3 (aq) + CaBr2 (aq) ->  2 KBr (s)  +  CaCO3 (aq)

2 K2CO3 (aq) + CaBr2 (aq) ->  2 KBr (aq)  +  CaCO3 (aq)

Ca2+ (aq) + CO32- (aq) ->  CaCO3(s)

Correct answer:

Ca2+ (aq) + CO32- (aq) ->  CaCO3(s)

Explanation:

Only the calcium and carbonate ions are reacting according to the solubility rules to form calcium carbonate.

Example Question #2 : Net Ionic Equations

What is the net ionic reaction when a solution of Cd(NO3)2 is reacted with (NH4)2S?

Possible Answers:

Cd(NO3)2 (aq) + (NH4)2S (aq) ->  CdS (s) + 2 NH4NO3 (aq)

Cd2+(aq) + S2- ->  CdS (s)

Cd(NO3)2 (aq) + (NH4)2S (aq) ->  CdS (aq) + 2 NH4NO3 (aq)

NH4+ (aq) + NO3- (aq)  ->  NH4NO3 (s)

Cd(NO3)2 (aq) + (NH4)2S (aq) ->  CdS (s) + 2 NH4NO3 (aq)

Correct answer:

Cd2+(aq) + S2- ->  CdS (s)

Explanation:

Only Cd and S ions are interacting according to the solubility rules to form a solid precipitant.

Example Question #3 : Net Ionic Equations

What is the net ionic reaction when a solution of rubidium sulfate is mixed with barium hydroxide?

Possible Answers:

No Reaction

Ba2+ (aq) + SO42- (aq)  ->  BaSO4 (s)

Rb2SO4 (aq) + Ba(OH)2 (aq)  ->  2 RbOH  (aq)  +  BaSO4 (s)

Rb+ (aq) + OH- (aq)  ->  RbOH (s)

Rb2SO4 (aq) + Ba(OH)2 (aq)  ->  2 RbOH  (s)  +  BaSO4 (aq)

Correct answer:

Ba2+ (aq) + SO42- (aq)  ->  BaSO4 (s)

Explanation:

Only the Ba and sulfate ions will react according to the solubility rules.

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