Question detail
Which answer avoids confusing sulfate ion with another qualitative analysis result?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Identification of ions by chemical and spectroscopic means
Question
- A. To prevent the formation of a coloured precipitate
- B. To ensure that only sulfate ions react with barium ions
- C. To dissolve any carbonate present
- D. To increase the solubility of barium sulfate
Answer
The correct answer is To ensure that only sulfate ions react with barium ions. It matches sulfate ion because the evidence is barium chloride after acidifying and the expected result is white precipitate.
Explanation
The correct option is To ensure that only sulfate ions react with barium ions. Use this as an exam check: if the observation is not white precipitate, the conclusion about sulfate ion is not properly supported. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
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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