Which equation shows the hydrogen carbonate ion acting as a Brønsted–Lowry acid?
A - HSC - SSCE Chemistry - Question 10 - 2022 - Paper 1
Question 10
Which equation shows the hydrogen carbonate ion acting as a Brønsted–Lowry acid?
A. HCO₃⁻(aq) ⇌ CO₃²⁻(aq) + H⁺(aq)
B. HCO₃⁻(aq) + H₂O(l) ⇌ H₂CO₃(aq) + OH⁻(aq)
C. ... show full transcript
Worked Solution & Example Answer:Which equation shows the hydrogen carbonate ion acting as a Brønsted–Lowry acid?
A - HSC - SSCE Chemistry - Question 10 - 2022 - Paper 1
Step 1
A. HCO₃⁻(aq) ⇌ CO₃²⁻(aq) + H⁺(aq)
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Answer
This equation shows the hydrogen carbonate ion (HCO₃⁻) donating a proton (H⁺), consequently forming the carbonate ion (CO₃²⁻). This process identifies HCO₃⁻ as a Brønsted–Lowry acid since it donates a proton.
Step 2
B. HCO₃⁻(aq) + H₂O(l) ⇌ H₂CO₃(aq) + OH⁻(aq)
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Answer
In this reaction, the hydrogen carbonate ion is not acting as an acid; rather, it is involved in a neutralization with water. Thus, this does not reflect its role as a Brønsted–Lowry acid.
Step 3
C. HCO₃⁻(aq) + NH₃(aq) ⇌ CO₃²⁻(aq) + NH₄⁺(aq)
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Answer
This equation correctly shows the hydrogen carbonate ion acting as a Brønsted–Lowry acid. It donates a proton to ammonia (NH₃), resulting in the formation of the carbonate ion (CO₃²⁻) and ammonium (NH₄⁺).
Step 4
D. HCO₃⁻(aq) + HCOOH(aq) ⇌ HCOO⁻(aq) + H₂CO₃(aq)
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Answer
Here, the reaction depicts HCO₃⁻ combining with formic acid (HCOOH), but it does not denote HCO₃⁻ acting as a Brønsted–Lowry acid since it is not clearly donating a proton.
