Net Ionic Equation for Acid-Carbonate Reaction

Steps:

• Write the balanced molecular equation: CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g).
• Identify spectator ions: Cl⁻(aq) does not participate, so remove 2HCl and CaCl₂.
• Form net ionic equation: CaCO₃(s) + 2H⁺(aq) → Ca²⁺(aq) + H₂O(l) + CO₂(g).
• Verify balance: Atoms and charges match on both sides.

Why C is correct:

• It represents the net ionic equation, excluding spectators, per ionic equation rules showing only reacting species.

Why the others are wrong:

• A: Full molecular equation, includes spectators like Cl⁻.
• B: Dissolves solid CaCO₃ into ions incorrectly; it's insoluble.
• D: Produces CO₃²⁻(aq) instead of CO₂(g), violating the reaction's gas evolution.

Final answer: C