Why are pK_a values important in determining the protonation state of EDTA?

• A. They show the color change of EDTA in different pH environments.
• B. They indicate the pH at which a group is 50% protonated and 50% deprotonated.
• C. They determine the solubility of EDTA in water.
• D. They are used to calculate the molecular weight of EDTA.

Answer: (B)