- Dry hydrogen gas must be passed through the combustion tube for a few minutes to remove all the air before heating the copper oxide.
- While heating the oxide, dry hydrogen is passed through continuously and excess of hydrogen gas must be burnt to prevent oxygen gas from the air oxidize the hot copper.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfyWbE57i1KI_eapI7hyRTNgTLYqO0xYP4S6P9qXh-XAEK8vVo_Ulrh3ILd3aTqVxamuQtqLX3vdubFiWD6uMLEvjN-nH6gdWhagp4bKKMb2claJDv4Dxld21Bn3nFwI8CgxlCzZEhp3k/s1600/1-250x250.jpg)
Black copper oxide
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