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After a test, a solution of zinc sulfate is contaminated with copper ions. How can the copper ions be removed efficiently? Why does a distillation and filtration not work?
Solution: - These are solutions (with water) and not two different solvents such as alcohol and water.
- Filtration is only possible if a solid and a liquid are present. In this case, they are only soluble in water, individual ions. These are much too small in size compared to the pore size of a filter
- Look at the electrode potential table:
Zn … Zn2+ (-0.76 V)
Cu … Cu2+ (+0.35 V)
So if a Zn plate is in …
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