24. Alanine, H₂NCH(CH₃)CO₂H, has K_a = 4.5×10^–3 and K_b = 7.4×10^–5 . What species has the highest concentration at a pH of 7.00 in H₂O? (Please use Structural Formula to demonstrate your answer)(log4.5=0.65，log7.4=0.87) 【第 33 格答案】。

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