Question detail
In the lichen written-response task for Metal hydroxide precipitate tests, explain how the evidence supports this objective: Recall that aluminium ions form a white precipitate that dissolves in excess sodium hydroxide..
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
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Topic
Identification of ions by chemical and spectroscopic means
Question
In the lichen written-response task for Metal hydroxide precipitate tests, explain how the evidence supports this objective: Recall that aluminium ions form a white precipitate that dissolves in excess sodium hydroxide..
Answer
A high-scoring answer should explain recall that aluminium ions form a white precipitate that dissolves in excess sodium hydroxide. Use evidence before identification: name the relevant test or measurement, state the observation, and then connect the result to Metal hydroxide precipitate tests.
Explanation
The important distinction is that metal ion test must be identified from precipitate observation; answers that swap in a different test or result do not match Metal hydroxide precipitate tests. A complete answer should use the approved objective wording, include the relevant evidence, and avoid unsupported identification claims.
Common mistake
Aluminium Ion Precipitate Confusion
Students often confuse the behaviour of aluminium ions with other metal ions, thinking that all white precipitates are the same and do not recognize that aluminium precipitate dissolves in excess sodium hydroxide.
Correct this by using the approved Metal hydroxide precipitate tests context: Recall that aluminium ions form a white precipitate that dissolves in excess sodium hydroxide. 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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