How to distinguish brass and red copper?
Jun 27, 2022
1. Color: brass is yellow or dark yellow, purple copper is light purple red.
2. Hardness: the hardness of the alloy is greater than that of the single component metal, that is to say, the hardness of brass is larger.
3. Melting point: the melting point of the alloy is lower than that of the single component metal, that is to say, the melting point of copper is larger.
4. (1) reducibility: hydrogen is produced by the reaction of brass and non-oxidizing acid, while copper does not react.
(2) galvanic cell principle: using the different potential of two metals, the two metals are connected with wires and put into the non-oxidizing acid to generate a very negative electrode of gas, namely brass.
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