BIOL 201 Lecture Notes - Lecture 2: Carboxylic Acid, Amine, Acid Dissociation Constant
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A dilute aqueous solution of glycine possesses a ph = 2. 0. Using the h- h equation: ph pka = log a- /ha. % - nh3+ / % - nh2. % - cooh / % - coo- . 2. 0 9. 8 = log - nh2. 7. 8 = log - nh2. Antilog of - 7. 8 = 0. Antilog of - 0. 4 = 0. 4. 1 - nh3+ 1 - cooh. % - nh3+ = 1 x 100 = 100% At ph 2. 0, 29% of molecules possess an - coo- group, therefore 71% possess an - .
