What is the buffer range for effective buffering?

• A. Between a 2:1 and 1:2 ratio of weak acid to conjugate base.
• B. Between a 10:1 and 1:10 ratio of weak acid to conjugate base.
• C. Between a 5:1 and 1:5 ratio of weak acid to conjugate base.
• D. Between a 1:1 and 1:1 ratio of weak acid to conjugate base.

Answer: (B)