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Histidine has ionizable groups with pKa values of 1.8, 6.0, and 9.2, as shown below. A...

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Chemistry

Histidine has ionizable groups with pKa values of 1.8, 6.0, and9.2, as shown below. A biochemist makes up 100 mL of a 0.100 Msolution of histidine at a pH of 5.40. She then adds 40 mL of 0.10M HCl. What is the pH of the resulting solution?

The book answer is 2.4. Please show work to help me understand howthey arrived at this.

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