Which of the following is the formula of EDTA?

University of Ilorin CHM107 2026 past question

1. HN(CH₂COOH)₂
2. N(CH₂COOH)₃
3. C₂H₄(N(CH₂COOH)₂)₂
4. C₆H₁₂N₂O₈

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