Why do we add an excess of copper carbonate?

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Tags

1. #leaving
2. #oxide
3. #sulfate
4. #paper
5. #evaporate
6. #filter
7. #mixture
8. #solid
9. #enough
10. #excess
11. #copper
12. #behind
13. #insoluble
14. #warmed
15. #usually
16. #water
17. #stays
18. #crystals
19. #residue
20. #react
21. #carbonate