Lactic acid is overproduced by the body of a person with lactic acidosis. A 0.21 M solution of lactic acid has a pH of 2.27. What is the K_a value for the acid?

• A. 1.1x10^-3
• B. 5.4x10^-3
• C. 1.4x10^-4
• D. 0.026

Answer: (C)