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What fraction of iminodiacetic acid is in each of its four forms (H3A, H2A–, HA2–, A3–)...

What fraction of iminodiacetic acid is in each of its four forms (H3A, H2A–, HA2–, A3–) at pH 3.069? The pKa values for iminodiacetic acid are 1.85 (pKa1), 2.84 (pKa2) and 9.79 (pKa3).

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