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Edexcel IAL Chemistry 19.11 amino acid acidity, basicity and peptides

Decide which groups gain or lose protons at the stated pH: amines protonate in acid, carboxyl groups deprotonate in alkali and peptide bonds link amino acids.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Predict amino acid forms at low, neutral or high pH from protonated groups.
  • Explain zwitterions using amine proton acceptance and carboxyl proton loss.
  • Count amino acids in peptide repeat units or draw dipeptide structures.

19.11—Experiments to investigate the characteristic behaviour of amino acids limited to: i acidity and basicity and the formation question 1

[Maximum number: 1]

The structure of the amino acid isoleucine is shown.

Figure for Question 19.11—Experiments to investigate the characteristic behaviour of amino acids limited to: i acidity and basicity and the formation question 1 — Edexcel A-Level Chemistry A2

What is the structure of isoleucine in a solution of pH=2 ?

A

A

B

B

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D

D

D

D

C

C

C

C

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