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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
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