In back titration, which statement best describes how the metal concentration is determined?

In back titration, which statement best describes how the metal concentration is determined?

• A. By measuring pH changes throughout the titration
• B. By comparing the volume of EDTA added before and after the endpoint
• C. By calibrating against a colorimetric endpoint
• D. By determining the metal concentration by comparing total EDTA to EDTA in excess

Answer: (D)