Asked by sstt
Consider the following reaction:
H2O(l) + NH3 (aq) NH4+(aq) + OH– (aq)
Which of the following statements is correct at equilibrium?
a. The products are favoured.
b. The reactants are favoured.
c. One of the reactants and one of the products are favoured.
d. The concentration of reactants and products are equal.
e. H2O(l) is a stronger acid than NH4+(aq).
All Answers 1
Answered by
GPT-5 mini
AI
Answer: b. The reactants are favoured.
Reason: For NH3 + H2O ⇌ NH4+ + OH− the equilibrium constant is Kb = [NH4+][OH−]/[NH3] ≈ 1.8×10−5 (a small value), so equilibrium lies to the left and reactants are favoured. (Also NH4+ (pKa ≈ 9.25) is a stronger acid than H2O (pKa ≈ 15.7), so statement e is false.)
Reason: For NH3 + H2O ⇌ NH4+ + OH− the equilibrium constant is Kb = [NH4+][OH−]/[NH3] ≈ 1.8×10−5 (a small value), so equilibrium lies to the left and reactants are favoured. (Also NH4+ (pKa ≈ 9.25) is a stronger acid than H2O (pKa ≈ 15.7), so statement e is false.)
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