Which structure is formed by aspartic acid in solution at pH 12?
A
B
C
D - AQA - A-Level Chemistry - Question 15 - 2018 - Paper 3
Question 15
Which structure is formed by aspartic acid in solution at pH 12?
A
B
C
D
Worked Solution & Example Answer:Which structure is formed by aspartic acid in solution at pH 12?
A
B
C
D - AQA - A-Level Chemistry - Question 15 - 2018 - Paper 3
Step 1
Identify the structure at pH 12
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Answer
At pH 12, aspartic acid exists predominantly in its deprotonated form due to the basic conditions. The carboxyl groups (
−COOH) of aspartic acid are deprotonated, resulting in
−COO⁻ ions. Therefore, the correct structure will show both carboxyl groups in their deprotonated states, along with the amino group remaining protonated.
Step 2
Choose the correct option based on the identified structure
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Answer
Based on the analysis, the structure formed by aspartic acid at pH 12 corresponds to option D. This option accurately reflects the deprotonated form of aspartic acid.
