How to distinguish between surface blackened copper bars and magnesia?

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How to distinguish between surface blackened copper bars and magnesia?
Views: 204  Update Date:Jun 24 , 2017
How to distinguish between surface blackened copper bars and magnesia?


Sampling, respectively, adding dilute hydrochloric acid, if there are bubbles, then the magnesium, no bubbles for the copper bar.


Sampling, igniting, combustible as magnesium, non-combustible for copper




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