In proteins, the amino acid histidine (His) plays an important role in many biological reactions. The pKa for the protonation of His to from HisH+=6.0. When pH=7.0, what is the fraction of total histadine that will be in the HisH+ form? Draw the chemical structure for this amino acid.

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter16: Reactions Between Acids And Bases
Section: Chapter Questions
Problem 16.66QE: Write the chemical equilibrium and expression for the equilibrium constants for the ionization of...
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In proteins, the amino acid histidine (His) plays an important role in many biological reactions. The pKa for the protonation of His to from HisH+=6.0. When pH=7.0, what is the fraction of total histadine that will be in the HisH+ form? Draw the chemical structure for this amino acid. 

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