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#13415

Repeating Rifle (Visitor)

metal flame test HELP me identify a mysterious copper-like metal

A safer test which avoids the use of acids would be to dip it in salt water. The end result (blue/green flame) is the same. My experience, little as it may be, would be that the yellow from socium in the salt will overwhelm blue and green from copper. Sodium yellow, a resonance line, is much easier to excite thermally than blue or green which requires a higher temperature to excite higher energy quantum states. This problem is even more apparent if you try to look for potassium violet radiation. Bill

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#13416

Repeating Rifle (Visitor)

metal flame test HELP me identify a mysterious copper-like metal
You can dissolve it in nitric acid and observe the color. It should be a blue solution. Although you will get a blue solution, the ammoniated solution is a much more striking blue that will detect copper at a lower concentration. Bill

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#13417

Mohammed Farooq (Visitor)

metal flame test HELP me identify a mysterious copper-like metal

You can do a simple flame test, dip the _meta_l or wire in nitric or hydrochloric acid( HCl doesn't attack it) The blue/green flame is caused by copper and chlorine. It won't happen if it is dipped in nitric acid. Possible reason: Copper nitrate in the flame might be reduced to its non-volatile oxide, unlike copper halides, however it is worthing trying to use copper nitrate crystal in a flame and see the change in flame color. Someone willing to try ?

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#13418

Oscar Lanzi III (Visitor)

metal flame test HELP me identify a mysterious copper-like metal
For the saltwater suggestion: If the sodium yellow is a problem, reverse the situation by using KCl for the dipping instead of NaCl.

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#13419

Dr F (Visitor)

metal flame test HELP me identify a mysterious copper-like metal

I strongly suspect that you are supposed to have learned answers to questions like what acid dissolves copper, or have learned how to find out. Instead of applying what you (hopefully) have learned, you want others to do it for you. For your information, we began this lab on the FIRST DAY of a basic highschool chemistry class. All that we knew about was specific heat and density. The teacher suggested that we ask others for ideas, so long as we gave them credit. Thank you so much, Marvin. You have demonstrated the vital importance of not assuming things. B.W.

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