A. evaporation to dryness
B. using chromatography
C. precipitation
D. crystallization
Correct Answer: Option D
D. crystallization
![Determine the amount of electrons needed to deposit 6.4g of copper during the electrolysis of copper (ll) tetraoxosulphate (IV) solution [Cu = 64]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "Determine the amount of electrons needed to deposit 6.4g of copper during the electrolysis of copper (ll) tetraoxosulphate (IV) solution [Cu = 64]")
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