Question detail
Explain why the sample must be acidified before adding barium chloride solution in the sulfate ion test.
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
Explain why the sample must be acidified before adding barium chloride solution in the sulfate ion test.
Answer
A high-scoring answer should explain recall that sulfate ions produce a white precipitate of barium sulfate. Use evidence before identification: name the relevant test or measurement, state the observation, and then connect the result to Sulfate ions.
Explanation
The important distinction is that sulfate ion must be identified from barium chloride after acidifying; answers that swap in a different test or result do not match Sulfate ions. A complete answer should use the approved objective wording, include the relevant evidence, and avoid unsupported identification claims.
Common mistake
Common Mistake in Sulfate Ion Tests
Students often confuse the white precipitate of barium sulfate with other white precipitates, such as those from carbonate or chloride tests.
Correct this by using the approved Sulfate ions context: Recall that sulfate ions produce a white precipitate of barium sulfate. 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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