Occurs when aqueous solutions of ammonia and vinegar are mixed — Acids and Bases Chemistry Question

STEPS:

1. Identify the Reactants: The two substances being mixed are aqueous ammonia ($NH_3$) and vinegar. In chemistry, vinegar is recognized as a dilute aqueous solution of acetic acid ($CH_3COOH$ or $HC_2H_3O_2$).
2. Classify the Chemical Species: Ammonia is a well-characterized weak base, and acetic acid is a well-characterized weak acid.
3. Determine the Reaction Type: When an acid and a base are mixed, they undergo a neutralization reaction.
4. Apply the Brønsted^-Lowry Definition: A Brønsted^-Lowry acid-base reaction is defined by the transfer of a proton ($H^+$) from an acid to a base. In this specific reaction, the acetic acid molecule donates a proton to the ammonia molecule:
$$NH_3(aq) + CH_3COOH(aq) \rightarrow NH_4^+(aq) + CH_3COO^-(aq)$$
5. Match with the Options: Because the primary process is the transfer of a proton from the acetic acid to the ammonia, it is classified as a Brønsted^-Lowry acid-base reaction (Option B).

WHY_OTHERS_WRONG:

• Oxidation-reduction reaction (A): There is no change in the oxidation states of any atoms involved in the reaction. The process involves only the movement of a proton ($H^+$), not the transfer of electrons required for a redox reaction.
• Sublimation (C): Sublimation is a physical phase change where a solid turns directly into a gas (such as $I_2(s) \rightarrow I_2(g)$). This does not apply to mixing two aqueous solutions.
• Dehydration (D): Dehydration reactions involve the removal of water from a molecule to form a new product. While some acid-base reactions produce water as a byproduct, this specific reaction between a weak acid and a weak base primarily focuses on the proton transfer between the species.
• Precipitation (E): A precipitation reaction occurs when two aqueous solutions react to form an insoluble solid. However, the products of this reaction—ammonium ions ($NH_4^+$) and acetate ions ($CH_3COO^-$)—form a salt (ammonium acetate) that is highly soluble in water, so no precipitate forms.