What substance and what quantity of it should be added to a buffer containing 30.0 mL of 0.200 M HF and 30.0 mL of 0.200 M F⁻ to destroy it?

• A. 0.002 mol HF
• B. 0.004 mol F⁻
• C. 0.008 mol HCl
• D. 0.001 mol NaOH

Answer: (C)