What Is the Equilibrium Constant Expression (K_a)for the Acid Dissociation

question 217

Multiple Choice

What is the equilibrium constant expression (K_a) for the acid dissociation of nitrous acid HNO₂? The equation of interest is HNO₂(aq) + H₂O(l) ⇌ H₃O⁺(aq) + NO₂^-(aq) .

• A)K_a = ([H₃O⁺][NO₂^-])/([HNO₂][H₂O])
• B)K_a = ([H₃O⁺][NO₂^-])/([HNO₂])
• C)K_a = ([HNO₂][H₂O])/([H₃O⁺][NO₂^-])
• D)K_a = ([HNO₂])/([H₃O⁺][NO₂^-])

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