Sodium Hydroxide Is Added to a 0

question 4

Multiple Choice

Sodium hydroxide is added to a 0.1 M solution of phenylalanine.Phenylalanine is a diprotic acid with two pK_as,2.20 for the carboxylic acid group and 9.31 for the ammonium functional group.When the pH = 5.93,the principal species is____________________ and when the pH = 10.10,the principal species is____________________ .

• A)H₂L⁺;H₂L⁺
• B)HL;L⁻
• C)H₂L⁺;L⁻
• D)H₂L⁺;HL
• E)HL;HL

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Definitions:

Anal

Pertaining to the anus, often used in a psychological context to describe personality traits associated with the anal stage of psychosexual development.

Oral

Relates to the mouth, including the act of speaking or consuming, often used in contexts ranging from communication methods to intake of food and medicine.

Phallic

Pertaining to the third stage in Freud's psychosexual development, characterized by a focus on genital organs and the conflict with sexual identity and desires.

Social-Cognitive Theory

A framework for understanding, predicting, and changing human behavior that emphasizes the interplay between personal, behavioral, and environmental influences.