5) Aspartic acid's pKa values are given below HO OH NH3 pKa=1.88 ? pKa=3.65 pKa=9.60 Aspartic.acid a) Explain the different pKa values for the carboxylic acid functional groups.[4 marks] b)Draw the major species in solution at pH=5 [2 marks]
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- pKa = 1.88 → the α‑carboxylic acid (the COOH directly on the α‑carbon next to the NH3+). - pKa = 3.65 → the side‑chain (β) carboxylic acid. - pKa = 9.60 → the amino group (NH3+ ⇌ NH2). Show more…
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