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An aqueous solution of acetic acid dissociates as CH3COOH + H2O ⇌ CH3COO⁻ + H3O⁺.

1. CH3COOH + H2O ⇌ CH3COO⁻ + H3O⁺
2. CH3COOH ⇌ CH3COO⁻ + H⁺
3. CH3COOH + H2O ⇌ CH3COOH₂⁺ + OH⁻
4. CH3COOH ⇌ CH3COOH₂⁺ + OH⁻

Correct answer: CH3COOH + H2O ⇌ CH3COO⁻ + H3O⁺

Solution

The dissociation of acetic acid in water involves the transfer of a proton (H⁺) from CH3COOH to H2O, forming CH3COO⁻ and H3O⁺. This matches option A.

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