Question detail
What observation indicates the presence of carbonate ions when a dilute acid is added to a sample?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Identification of ions by chemical and spectroscopic means
Question
What observation indicates the presence of carbonate ions when a dilute acid is added to a sample?
Answer
A high-scoring answer should explain interpret effervescence and limewater turning milky as evidence for carbonate ions. Use method first, observation second, conclusion last: name the relevant test or measurement, state the observation, and then connect the result to Carbonate ions.
Explanation
This is correct because acid then limewater is the evidence expected for carbonate ion, and carbon dioxide is produced is the result that supports the conclusion. A complete answer should use the approved objective wording, include the relevant evidence, and avoid unsupported identification claims.
Common mistake
Misinterpreting Effervescence
Students often confuse the effervescence produced by carbonate ions with other gas reactions, leading to incorrect conclusions about the presence of carbonate ions.
Correct this by using the approved Carbonate ions context: Interpret effervescence and limewater turning milky as evidence for carbonate ions. Name the correct test or chemistry idea, state the observation accurately, and then give the conclusion supported by that evidence. Do not swap gas tests, flame tests, cation tests, anion tests, chromatography terms, pure substances, and formulations.
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