A-LevelChemistryEquilibriaOct/Nov 2021Paper 1 Q161 Mark
Silver chloride and silver iodide form equilibria when added to water. AgCl(s) ⇌ Ag⁺(aq) + Cl⁻(aq) K = K₁ AgI(s) ⇌ Ag⁺(aq) + I⁻(aq) K = K₂ Each equilibrium position lies well to the left. Silver iodide will not dissolve in aqueous ammonia. Silver chloride will dissolve in aqueous ammonia. Another equilibrium is formed. Ag⁺(aq) + 2NH3(aq) ⇌ Ag(NH3)2⁺(aq) K = K₃ The position of this equilibrium lies to the right. What is the order of magnitude for these three equilibrium constants?
AK3 (smallest), K2, K1 (largest)
BK3 (smallest), K1, K2 (largest)
CK2 (smallest), K1, K3 (largest)
DK1 (smallest), K2, K3 (largest)
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The correct answer is C. This question tests the candidate's understanding of equilibria within the Chemistrysyllabus. The examiner's mark scheme requires...
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