A-LevelChemistryGroup 179701/12 · Oct/Nov 2020 · Q141 Mark
AgNO₃(aq) is added to a solution of a halide ion, X⁻(aq), and aqueous ammonia is then added. The ionic equations for the two reactions that occur are shown. Ag⁺(aq) + X⁻(aq) ⇌ AgX(s) equilibrium 1 Ag⁺(aq) + 2NH₃(aq) ⇌ Ag(NH₃)₂⁺(aq) equilibrium 2 Which statement is correct?
AThe position of equilibrium 1 lies to the left when X⁻ = I⁻.
BIncreasing the concentration of ammonia causes the position of equilibrium 1 to move to the left.
CK for equilibrium 2 is larger when X⁻ = Cl⁻ than when X⁻ = I⁻.
DEquilibrium 2 is a redox reaction.
✓ Correct answer
B: Increasing the concentration of ammonia causes the position of equilibrium 1 to move to the left.
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