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I did the following experiment:

Experimental setup:

Two electrodes (one made out of Iron,the other made out of Copper) are put into a (bluish) Copper(ii) sulfate lotion.

enter image description here

Then, one connect a voltmeter to them to measure the potential.

enter image description here

Finally, one disconnect the voltmeter and connect an Amperemeter to measure the electrical current.

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Observations:

-Copper accumulates around the iron electrode,forming a thick copper coloured slick around it.

-there is a potential of about 0.5 V between the electrodes, which stays for several minutes.

-when one connect the amperemeter, one can measure a current which stays at least for a few seconds. (didn't measure further)

-there is no (visible) activity around the copper electrode.

-the solution doesn't change its colour notably.

-especially, one could not observe any evolution of gas. (although this does not mean that there is absolutely no gas evolution)

How is the measured tension and current caused?

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    $\begingroup$ What's unclear about it? This is a simple galvanic cell. $\endgroup$ – Ivan Neretin May 21 at 15:14
  • $\begingroup$ @Ivan Neretin : There is just one chamber! AFAIK galvanic cells have two chambers. $\endgroup$ – KGM May 21 at 15:14
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    $\begingroup$ All right, this is a bad galvanic cell. So what? The reactions are the same. $\endgroup$ – Ivan Neretin May 21 at 15:17
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    $\begingroup$ Could you do the same for a normal galvanic cell with two chambers? $\endgroup$ – Ivan Neretin May 21 at 15:20
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    $\begingroup$ Now imagine another situation: no wires, just an iron rod in the CuSO4 solution. Surely you must have heard about the substitution reaction which will take place here. $\endgroup$ – Ivan Neretin May 21 at 15:26

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