Compare the stability of the two salt bridges shown circled in blue at pH 8.4. The carboxylate ions are completely de- protonated at pH 8.4 The pka of the amino group (upper left) is 8.1 and the pka of the amino group (bottom right) is 8.7. 9 5-6- CH₂COOH (0 H--O=C (b) KHANH, The bottom right salt bridge is stronger due to the partial positive charge of +2/3. The bottom right salt bridge is stronger due to the partial positive charge of +1/3. The upper left salt bridge is stronger due to the partial positive charge of +1/3. The upper left salt bridge is stronger due to the partial positive charge of +2/3.

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