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: 432  Update Date:Jun 24 , 2017
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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