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Which can not function as a Bronsted-Lowry acid? A - AQA - A-Level Chemistry - Question 13 - 2022 - Paper 3

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Question 13

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Which can not function as a Bronsted-Lowry acid? A. CH₃COO⁻ B. HCO₂⁻ C. H₂O⁺ D. NH₄⁺

Worked Solution & Example Answer:Which can not function as a Bronsted-Lowry acid? A - AQA - A-Level Chemistry - Question 13 - 2022 - Paper 3

Step 1

A. CH₃COO⁻

96%

114 rated

Answer

The acetate ion (CH₃COO⁻) is a conjugate base of acetic acid and cannot function as a Bronsted-Lowry acid since it does not donate protons.

Step 2

B. HCO₂⁻

99%

104 rated

Answer

The formate ion (HCO₂⁻) is the conjugate base of formic acid and thus does not act as a Bronsted-Lowry acid.

Step 3

C. H₂O⁺

96%

101 rated

Answer

The hydronium ion (H₂O⁺) can donate protons, making it able to function as a Bronsted-Lowry acid.

Step 4

D. NH₄⁺

98%

120 rated

Answer

The ammonium ion (NH₄⁺) can also donate protons, therefore it functions as a Bronsted-Lowry acid.

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