Net Ionic Equation for Precipitation

Steps:

• Write the molecular equation: 2AgNO₃(aq) + K₂CrO₄(aq) → Ag₂CrO₄(s) + 2KNO₃(aq).
• Dissociate into total ionic: 2Ag⁺(aq) + 2NO₃⁻(aq) + 2K⁺(aq) + CrO₄²⁻(aq) → Ag₂CrO₄(s) + 2K⁺(aq) + 2NO₃⁻(aq).
• Cancel spectator ions (K⁺ and NO₃⁻) that appear unchanged on both sides.
• Result: 2Ag⁺(aq) + CrO₄²⁻(aq) → Ag₂CrO₄(s), matching option C.

Why C is correct:

• It is the net ionic equation, showing only reacting species per solubility rules for precipitates.

Why the others are wrong:

• A includes spectator ions and is the full molecular equation.
• B is the total ionic equation without canceling spectators.
• D has incorrect 1:1 stoichiometry and formula (Ag₂CrO₄ requires 2:1 ratio).

Final answer: C