What are the typical products of a neutralization reaction between an acid and a base?

• A. Hydrogen gas and water
• B. Carbon dioxide and water
• C. Hydrochloric acid and a base
• D. Salt and water

Answer: (D)

Neutralization of an acid by a base typically produces salt and water. In a classic example, hydrochloric acid reacts with sodium hydroxide to form sodium chloride and water. The hydrogen ions from the acid combine with the hydroxide ions from the base to make water, while the remaining ions pair up to form a salt. Hydrogen gas shows up in reactions where an acid meets a reactive metal, not in standard acid–base neutralization. Carbon dioxide and water can appear when carbonates or bicarbonates are involved, but for a typical neutralization the main products are salt and water. The option listing the reactants (acid and base) as products doesn’t fit the question.