Write a reaction equation showing how a buffer solution made from combining aqueous solutions of HCN and NaCN will neutralize an added base.

• A. HCN(aq) + H₂O(aq) → CN^–(aq) + OH^–(aq)
• B. HCN(aq) + OH^–(aq) → CN^–(aq) + H₂O(l)
• C. CN^–(aq) + OH^–(aq) → CN^–(aq) + H₂O(l)
• D. CN^–(aq) + H₂O(aq) → HCN(aq) + H₃O⁺(aq)

Answer: (B)