How can you determine if an acid is strong or weak using its K_a value?

• A. An acid is strong if its K_a value is less than 1.
• B. An acid is strong if its K_a value is greater than 1.
• C. An acid is weak if its K_a value is greater than 1.
• D. An acid is weak if its K_a value is equal to 1.

Answer: (B)