The amino acid Valine (Val) will have the following proton transfer equilibria in water: H2Val = HVal + H+ Kal HVal = Val²- + H+ Ka2 = where the species H2Val, HVal¯ and Val2 are the fully protonated, singly deprotonated, and fully deprotonated valine species, respectively. Determine the fraction of fully deprotonated valine, Val2", at pH 8.77. Report your answer to 2 decimal places

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter26: Molecular Absorption Spectrometry
Section: Chapter Questions
Problem 26.25QAP
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The amino acid Valine (Val) will have
the following proton transfer equilibria
in water:
H2Val = HVal¯ + H+
Kal
HVal¯ = Val²- + H+
Ka2 =
Каг
where the species H2Val, HVal¯ and
Val2 are the fully protonated, singly
deprotonated, and fully deprotonated
valine species, respectively. Determine
the fraction of fully deprotonated
valine, Val2", at pH 8.77. Report your
answer to 2 decimal places
Transcribed Image Text:The amino acid Valine (Val) will have the following proton transfer equilibria in water: H2Val = HVal¯ + H+ Kal HVal¯ = Val²- + H+ Ka2 = Каг where the species H2Val, HVal¯ and Val2 are the fully protonated, singly deprotonated, and fully deprotonated valine species, respectively. Determine the fraction of fully deprotonated valine, Val2", at pH 8.77. Report your answer to 2 decimal places
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