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Can you please explain how the correct answer +1.5? What is the net charge of the peptide NH3-his-lys-COO at pH 6? For his: pkai -

Can you please explain how the correct answer +1.5?
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What is the net charge of the peptide NH3-his-lys-COO at pH 6? For his: pkai - 1.8, PK 2 = 6.0, PK 3 = 9.3 For lys: pK,1 -2.2, pka2 = 9.0, PK 3 = 10.5 5 0 -15 Correct Answer +1.5 You Answered - 1

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