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The amino acid histidine has ionizable groups with pKa values of 1.8,6.0, and 9.2, as shown. group A biochemist makes up 90mL of a 0.11M

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The amino acid histidine has ionizable groups with pKa values of 1.8,6.0, and 9.2, as shown. group A biochemist makes up 90mL of a 0.11M solution of histidine at a pH of 5.1. She then adds 60mL of 0.10MHCl. What is the pH of the resulting solution

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