SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Why is ammonia used to test for copper in a solution? Choose the best answer.
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Different people see colors differently.
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The ammonia test can detect smaller amounts of copper than the human eye can detect.
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The odor of ammonia is easily detected by most people.
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All chemical tests are superior to relying on information provided by the senses.
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Explanation:
Detailed explanation-1: -When concentrated ammonia solution (ammonium hydroxide) is added to a clear, light blue, aqueous solution of copper(II) chloride, a powdery, light blue precipitate of copper(II) hydroxide forms. Further addition of ammonia causes the copper ion to go back into solution as a deep blue ammonia complex.
Detailed explanation-2: -It donates its electron pair and forms a linkage with metal ion.
Detailed explanation-3: -Copper(II) ion reacts with stoichiometric quantities of aqueous ammonia to precipitate light blue Cu(OH)2. Some basic salts may also form.
Detailed explanation-4: -This new method is centered on the use of ammonia as an indicator to detect the presence of copper(II) ions in solution.
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