Vitamin 'C' or ascorbic acid is an essential nutrient for human beings and certain other animal species. Below is the structure of the ascorbic acid. 2. Но HO. OH The pKa of ascorbic acid (vitamin C) is 4.17, showing that it is slightly more acidic than acetic acid (CH3COOH, pK, 4.74). (a) Show the four different conjugate bases that would be formed by deprotonation of the four different OH groups in ascorbic acid. (b) Compare the stabilities of these four conjugate bases, and predict which OH group of ascorbic acid is the most acidic.

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