Which of the following reactions is most consistent with that of a base?

• A. a) NH₄⁺ → NH₃ + H⁺
• B. b) H₂CO₃ → HCO₃^- + H⁺
• C. c) NaOH → Na⁺ + OH^-
• D. d) HCl → H⁺ + Cl^-

Answer: (C)

Verified step by step guidance

1. Identify the definition of a base in chemistry: A base is a substance that can accept hydrogen ions (H+) or donate hydroxide ions (OH-).
2. Examine each reaction to determine if it involves the donation of OH- ions or the acceptance of H+ ions.
3. Analyze reaction a) NH4+ → NH3 + H+: This reaction involves the release of H+ ions, which is characteristic of an acid, not a base.
4. Analyze reaction b) H2CO3 → HCO3- + H+: This reaction also involves the release of H+ ions, indicating acidic behavior.
5. Analyze reaction c) NaOH → Na+ + OH-: This reaction involves the release of OH- ions, which is characteristic of a base, as it donates hydroxide ions.