Question detail
What color precipitate is formed when copper(II) ions react with sodium hydroxide?
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 color precipitate is formed when copper(II) ions react with sodium hydroxide?
Answer
A high-scoring answer should explain recall that copper(II) ions form a blue precipitate with sodium hydroxide. Use method first, observation second, conclusion last: name the relevant test or measurement, state the observation, and then connect the result to Metal hydroxide precipitate tests.
Explanation
This is correct because precipitate observation is the evidence expected for metal ion test, and cation identity 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
Copper(II) Ion Precipitate Mistake
Students often confuse the color of the precipitate formed by copper(II) ions with that of other metal ions, such as iron(II) or aluminum.
Remember that copper(II) ions specifically form a blue precipitate with sodium hydroxide, while iron(II) forms a green precipitate and aluminum forms a white precipitate.
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