STANDARD Chemistry Ionization Constants MCQ Question
Kₐ₁, Kₐ₂, and Kₐ₃ are the respective ionization constants for the following reactions: H₂O ⇌ H⁺ + HS⁻, HS⁻ ⇌ H⁺ + S²⁻, H₂S ⇌ 2H⁺ + S²⁻. The correct relationship between Kₐ₁, Kₐ₂, and Kₐ₃ is
Kₐ₃ = Kₐ₁ × Kₐ₂
Kₐ₃ = Kₐ₁ + Kₐ₂
Kₐ₃ = Kₐ₁ - Kₐ₂
Kₐ₃ = Kₐ₁ / Kₐ₂
Correct Answer
Detailed Explanation
For the reaction H₂S ⇌ 2H⁺ + S²⁻, Kₐ₃ = [H⁺]²[S²⁻]/[H₂S]. This is the product of the ionization constants of the two-step reactions: Kₐ₃ = Kₐ₁ × Kₐ₂.
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