Multiple Choice
Which of the following represents the complete ionic equation for the reaction of aqueous Hg2(NO3)2 with aqueous NaCl to form solid Hg2Cl2 and aqueous NaNO3?
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6. Chemical Quantities & Aqueous Reactions
Complete Ionic Equations
Multiple Choice
Which of the following is the balanced complete ionic equation for the reaction K2SO4(aq) + CaI2(aq) → CaSO4(s) + KI(aq)?
A
2K+(aq) + SO4^2-(aq) + Ca^2+(aq) + 2I-(aq) → Ca^2+(aq) + SO4^2-(aq) + 2K+(aq) + 2I-(aq)
B
2K+(aq) + SO4^2-(aq) + Ca^2+(aq) + 2I-(aq) → CaSO4(s) + 2K+(aq) + 2I-(aq)
C
K2SO4(aq) + CaI2(aq) → Ca^2+(aq) + SO4^2-(aq) + 2K+(aq) + 2I-(aq)
D
K2SO4(aq) + CaI2(aq) → CaSO4(s) + 2KI(aq)
Verified step by step guidance1
Identify the reactants and products in the given chemical equation: K2SO4(aq) + CaI2(aq) → CaSO4(s) + KI(aq).
Write the dissociation of the aqueous compounds into their respective ions: K2SO4(aq) dissociates into 2K+(aq) and SO4^2-(aq); CaI2(aq) dissociates into Ca^2+(aq) and 2I-(aq).
Write the complete ionic equation by including all the ions from the dissociated reactants: 2K+(aq) + SO4^2-(aq) + Ca^2+(aq) + 2I-(aq) → CaSO4(s) + 2K+(aq) + 2I-(aq).
Identify the spectator ions, which are ions that appear unchanged on both sides of the equation. In this case, 2K+(aq) and 2I-(aq) are spectator ions.
Write the net ionic equation by removing the spectator ions, leaving only the ions that participate in forming the precipitate: Ca^2+(aq) + SO4^2-(aq) → CaSO4(s).
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