O Levels Chemistry (5070)•5070/12/M/J/19
Explanation
Precipitation of Insoluble Silver Chloride Steps:
- Recognize AgCl as insoluble in water, best prepared via precipitation.
- Select soluble silver and chloride salts for reaction.
- Use AgNO₃(aq) and NaCl(aq) to form AgCl precipitate.
- Confirm option D matches this double displacement: AgNO₃ + NaCl → AgCl↓ + NaNO₃.
Why D is correct:
- Double displacement reaction produces insoluble AgCl precipitate per solubility rules (Ag⁺ + Cl⁻ → AgCl, Ksp = 1.8 × 10⁻¹⁰).
Why the others are wrong:
- A: Produces AgCl but uses acid, risking side reactions or excess H⁺ interference.
- B: Direct combination impractical; silver reacts slowly with Cl₂ gas.
- C: Burning silver in Cl₂ is hazardous and inefficient for lab preparation.
Final answer: D
Topic: Preparation of salts
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