Question

Sodium hydroxide is added to a 0.1 M solution of phenylalanine. Phenylalanine is a diprotic acid with two pKas, 2.20 for the carboxylic acid group and 9.31 for the ammonium functional group. When the pH 5.93, the principal species is 10.10 , the principal species is and when the pH a. H2L*; H2L b. HL; L c. H2L*; L d. H2L; HL e. HL; HL

Answer 1

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Structure of Phenyl Alanina Ph-CH2-C4g Coon 3 - Hz - CH - C At lower pH Ph-CH₂-CH-coon (H₂L+) pkeq=2-20 Ph-CH₂ ch - cool (HL) IT kay = 1937 Ph-CH2=CH-c014-) - NH₂ as pH = 5-13 dominate/ principal species is HL __pH = 10.10 dominate / principer species is L - correct option (B)