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Which structure is formed by aspartic acid in solution at pH 12? A H₂N—CH—COO⁻ | COOH B H₂N—CH—COOH | COOH C H₂N—CH—COO⁻ | COO⁻ D H₂N—CH—COOH | COO⁻ - AQA - A-Level Chemistry - Question 15 - 2018 - Paper 3

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Question 15

Which-structure-is-formed-by-aspartic-acid-in-solution-at-pH-12?--A--H₂N—CH—COO⁻----------|--------COOH--B--H₂N—CH—COOH----------|--------COOH--C--H₂N—CH—COO⁻----------|--------COO⁻--D--H₂N—CH—COOH----------|--------COO⁻-AQA-A-Level Chemistry-Question 15-2018-Paper 3.png

Which structure is formed by aspartic acid in solution at pH 12? A H₂N—CH—COO⁻ | COOH B H₂N—CH—COOH | COOH C H₂N—CH—COO⁻ ... show full transcript

Worked Solution & Example Answer:Which structure is formed by aspartic acid in solution at pH 12? A H₂N—CH—COO⁻ | COOH B H₂N—CH—COOH | COOH C H₂N—CH—COO⁻ | COO⁻ D H₂N—CH—COOH | COO⁻ - AQA - A-Level Chemistry - Question 15 - 2018 - Paper 3

Step 1

Identify the relevant pH conditions

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Answer

At pH 12, aspartic acid would predominantly exist in its deprotonated form, where the carboxylic acid groups lose protons (H⁺) and are negatively charged.

Step 2

Analyze the given structures

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Answer

Examine each option (A, B, C, D) to determine which one reflects deprotonation of the carboxylic acid groups at pH 12.

Step 3

Select the correct structure

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101 rated

Answer

The correct structure is D, as it shows the amine group (H₂N) and has both carboxylic acid groups as COO⁻, which is consistent with the condition at pH 12.

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