Multiple Choice
What is the balanced complete ionic equation for the acid-base reaction: HC2H3O2(aq) + LiOH(aq) → ?
6. Chemical Quantities & Aqueous Reactions
Complete Ionic Equations
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Which of the following is the balanced complete ionic equation for the reaction: CaS(aq) + NiCl2(aq) → NiS(s) + CaCl2(aq)?
A
Ca^2+(aq) + S^2-(aq) + Ni^2+(aq) + 2Cl^-(aq) → Ni^2+(aq) + S^2-(aq) + CaCl2(aq)
B
Ca^2+(aq) + Ni^2+(aq) + 2Cl^-(aq) → NiS(s) + Ca^2+(aq) + 2Cl^-(aq)
C
CaS(aq) + Ni^2+(aq) + 2Cl^-(aq) → NiS(s) + Ca^2+(aq) + 2Cl^-(aq)
D
Ca^2+(aq) + S^2-(aq) + Ni^2+(aq) + 2Cl^-(aq) → NiS(s) + Ca^2+(aq) + 2Cl^-(aq)
Verified step by step guidance1
Identify the compounds involved in the reaction: CaS(aq), NiCl2(aq), NiS(s), and CaCl2(aq).
Write the dissociation of each aqueous compound into its ions: CaS(aq) dissociates into Ca^2+(aq) and S^2-(aq); NiCl2(aq) dissociates into Ni^2+(aq) and 2Cl^-(aq).
Recognize that NiS(s) is a solid and does not dissociate into ions, while CaCl2(aq) dissociates into Ca^2+(aq) and 2Cl^-(aq).
Combine all the ions from the reactants side: Ca^2+(aq) + S^2-(aq) + Ni^2+(aq) + 2Cl^-(aq).
Write the complete ionic equation by showing the formation of the solid NiS(s) and the remaining ions: NiS(s) + Ca^2+(aq) + 2Cl^-(aq).
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