Multiple Choice
Which of the following is the balanced complete ionic equation for the reaction K2SO4(aq) + CaI2(aq) → CaSO4(s) + KI(aq)?
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6. Chemical Quantities & Aqueous Reactions
Complete Ionic Equations
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What are the spectator ions in the reaction between Mg(OH)2 (aq) and HCl (aq)?
A
Cl⁻ only
B
Mg²⁺ only
C
OH⁻ and H⁺
D
Mg²⁺ and Cl⁻
Verified step by step guidance1
Write the balanced chemical equation for the reaction between Mg(OH)2 (aq) and HCl (aq). The balanced equation is: Mg(OH)2 (aq) + 2HCl (aq) → MgCl2 (aq) + 2H2O (l).
Identify the ions present in the aqueous solutions before the reaction. Mg(OH)2 dissociates into Mg2+ and 2OH-, while HCl dissociates into H+ and Cl-.
Determine the ions that form the products. MgCl2 dissociates into Mg2+ and 2Cl-, and water (H2O) is a neutral molecule.
Identify the ions that do not participate in the formation of the precipitate or the neutral molecule. These ions remain unchanged on both sides of the equation and are called spectator ions.
Compare the ions on both sides of the equation. The Cl- ions remain unchanged and do not participate in the formation of the precipitate or water, making them the spectator ions in this reaction.
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