Question detail
Explain how barium chloride supports this AQA GCSE Chemistry objective: explain that the sample is acidified before adding barium chloride solution.
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 how barium chloride supports this AQA GCSE Chemistry objective: explain that the sample is acidified before adding barium chloride solution.
Answer
A strong answer should state the relevant chemistry idea, explain how it applies in Sulfate ions, and finish by linking back to Identification of ions by chemical and spectroscopic means.
Explanation
This answer is correct because it directly supports the approved learning objective: Explain that the sample is acidified before adding barium chloride solution. It stays inside Sulfate ions, uses barium chloride as the revision focus, and gives the Chemistry reasoning needed for an exam-style response.
Common mistake
Acidification Step Confusion
Students often forget to acidify the sample before adding barium chloride solution, leading to incorrect results.
Correct this by using the approved Sulfate ions context: Explain that the sample is acidified before adding barium chloride solution. 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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