Worksheet: Balancing Ionic Equations

In this worksheet, we will practice balancing chemical equations by consideration of the atom numbers, charges, electron counts, and oxidation states.

Q1:

Write a net ionic equation for the following reaction. KCO()+Ba(OH)()2KOH()+BaCO()224224aqaqaqs

  • A2K()+CO()+Ba()+2OH()BaCO()+2K()+2OH()+2422+24+aqaqaqaqsaqaq
  • BBa()+CO()BaCO()+2424aqaqs
  • C2K()+CO()+Ba()+2OH()Ba()+CO()+2K()+2OH()+24++24+aqaqaqaqssaqaq
  • DBa()+CO()BaCO()2+24224aqaqs
  • EBa()+CO()Ba()+CO()2+2422+242aqaqss

Q2:

Write a net ionic equation for the formation of solid calcium fluoride and aqueous sodium chloride from aqueous solutions of calcium chloride and sodium fluoride.

  • ACa()+2F()+2Na()+2Cl()CaF()+2NaCl()2++2aqaqaqaqsaq
  • BCa()+2Cl()+2Na()+2F()Ca()+2F()+2Na()+2Cl()2++2++aqaqaqaqssaqaq
  • CCaCl()+2NaF()CaF()+2NaCl()22aqaqsaq
  • DCa()+2F()Ca()+2F()2+2+aqaqss
  • ECa()+2F()CaF()2+2aqaqs

Q3:

When iron(II) ions react with cerium(IV) ions in water, iron(III) and cerium(III) ions are produced.

Write the reduction half-equation for this reaction, including state symbols.

  • ACe()+eCe()4+3+aqaq
  • BCe()+2eCe()4+2+aqaq
  • CCe()+3eCe()6+3+aqaq
  • DFe()+2eFe()3++aqaq
  • EFe()+eFe()3+2+aqaq

Write a balanced ionic equation for this reaction, including state symbols.

  • AFe()+Ce()Fe()+Ce()2+3+3+4+aqaqaqaq
  • B2Fe()+Ce()2Fe()+Ce()3+4+2+2+aqaqaqaq
  • C3Fe()+Ce()3Fe()+Ce()3+6+2+3+aqaqaqaq
  • DFe()+Ce()Fe()+Ce()2+4+3+3+aqaqaqaq
  • EFe()+2Ce()Fe()+2Ce()+3+3+4+aqaqaqaq

Q4:

When lead, ammonium, carbonate, and nitrate ions are mixed in aqueous solution, a precipitation reaction takes place. Write a balanced net ionic equation for this reaction, including state symbols.

  • ANH()+NO()NHNO()4+343aqaqs
  • BPb()+CO()+NH()+NO()PbCO()+NHNO()2+324+3343aqaqaqaqss
  • CPb()+CO()PbCO()2+323aqaqs
  • DPb()+2NO()Pb(NO)()2+332aqaqs
  • EPb()+2NO()+2NH()+CO()Pb(NO)()+(NH)CO()2+34+3232423aqaqaqaqss

Q5:

In aqueous solution, carbon dioxide reacts with excess sodium hydroxide to form aqueous sodium carbonate. Write a balanced net ionic equation for this reaction, including state symbols.

  • A2CO()+2OH()2CO()+H()2322aqaqaqg
  • BCO()+OH()CO()+H()232+aqaqaqaq
  • CCO()+2OH()CO()+HO()2322aqaqaql
  • D2CO()+2NaOH()2NaCO()+H()232aqaqaqg
  • ECO()+2NaOH()NaCO()+HO()2232aqaqaql

Q6:

Sodium hydroxide and chlorine gas can be produced by the electrolysis of aqueous sodium chloride. Write a balanced net ionic equation for this reaction, including state symbols.

  • A2NaCl()+2HO()2NaOH()+2H()+Cl()aqlaqaqg2+2
  • B2Cl()+2Na()+2HO()2NaOH()+2H()+Cl()+2+2aqaqlaqaqg
  • C2Cl()+2HO()2OH()+2H()Cl()2+2aqlaqaqg
  • D2Cl()+2HO()2OH()+H()+Cl()222aqlaqgg
  • E2NaCl()+2HO()2NaOH()+H()+Cl()aqlaqgg222

Q7:

When barium, potassium, sulfate, and nitrate ions are mixed in aqueous solution, a precipitation reaction takes place. Write a balanced net ionic equation for this reaction.

  • A2K()+SO()KSO()+4224aqaqs
  • BBa()+SO()+K()+NO()BaSO()+KNO()2+42+343aqaqaqaqss
  • CBa()+SO()BaSO()2+424aqaqs
  • DK()+NO()KNO()+33aqaqs
  • EBa()+SO()+2K()+2NO()Ba(NO)()+KSO()2+42+33224aqaqaqaqss

Q8:

When silver, lithium, chloride, and acetate ions are mixed in aqueous solution, a precipitation reaction takes place. Write a balanced net ionic equation for this reaction, including state symbols.

  • AAg()+Cl()AgCl()+aqaqs
  • BLi()+Cl()+Ag()+2CHCO()LiCl()+Ag(CHCO)()+2+32322aqaqaqaqss
  • CLi()+CHCO()LiCHCO()+3232aqaqs
  • DLi()+CHCO()+Ag()+Cl()LiCHCO()+AgCl()+32+32aqaqaqaqss
  • EAg()+2CHCO()Ag(CHCO)()2+32322aqaqs

Q9:

Write the reduction half-equation, including state symbols, for the conversion of solid HgCl22 to liquid mercury in water.

  • AHgCl()+4e2Hg()+Cl()222slaq
  • BHgCl()+2e2Hg()+2Cl()22slaq
  • CHg()+eHg()+aql
  • DHg()+2eHg()2+aql
  • E2Cl()+2eCl()2aqaq

Q10:

Write the reduction half-equation, including state symbols, for the formation of silver from aqueous diamminesilver(I) nitrate, [Ag(NH)]NO323.

  • AAg()+eAg()+aqs
  • BAg()+eAg()+aqaq
  • C[Ag(NH)]NO()+eAg()+2NH()+NO()32333aqaqaqaq
  • D[Ag(NH)]()+eAg()+2NH()32+3aqaqaq
  • E[Ag(NH)]()+eAg()+2NH()32+3aqsaq

Q11:

Write the reduction half-equation, including state symbols, for the conversion of SnCl4 to SnCl2 in water.

  • ASn()+2eSn()4+2+aqaq
  • BSn()+eSn()2++aqaq
  • CSn()+2eSn()4+2+aqaq
  • DCl()+eCl()2aqaq
  • ECl()+2e2Cl()2aqaq

Q12:

What name is given to the ions in a reaction equation that are not included in the net ionic equation?

  • AUnreactive ions
  • BUnbalanced ions
  • CSpectator ions
  • DBystander ions
  • EWatching ions

Q13:

The incomplete half-equation of the reduction of aluminum ions to aluminum is as follows: AlAl3+.

To which side do electrons need to be added?

  • ALeft
  • BRight

How many electrons need to be added?

Q14:

Which of the following is not always conserved between the two sides of a balanced ionic equation?

  • AThe total charge
  • BThe sum of oxidation states
  • CThe number of ions
  • DThe number of electrons
  • EThe number of atoms or ions of each element

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