..
.
In the previous experiment a current of 0.3
µA was flowing from Zn which was oxidized to copper. Cu2+(aq)
ions as electron acceptors were reduced
forming Cu.
* Connect the Zn and Cu electrodes (2. photo) by a wick and by a wire
(left photo).
* Leave this Galvanic Cell for some days, keep the wick humid by adding
distilled water.
Observations and explanations:
Right photo: Crystals of Cu metal are formed on the Cu electrode.
3. photo: The bue colour of the copper sulfate electrolyte fades
as the Cu2+(aq) ions are reduced to Cu.