How is excess copper oxide removed?

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Tags

1. #copper
2. #remove
3. #solution
4. #sulfate
5. #until
6. #continue
7. #evaporate
8. #filter
9. #filtrate
10. #adding
11. #water
12. #mixture
13. #excess
14. #powder
15. #oxide
16. #basin
17. #evaporating