We can make a simple voltaic cell consisting of Cu and Zn electrodes dipped in an aqueous H2SO4 solution for demonstration purposes. I am curious to know whether this has a constructible cell notation or not, since I have not come across one in any book so far.

Also, the cell reaction generates H2 gas which makes me doubt that an electric double layer involving H+ ions is formed faster than that involving Cu2+ ions from a Cu electrode. It is also For the reason that , we see no detectable blue colouration around Cu when the set up - simple cell is in operation. Is that right?

Moreover, does the acidic solution have a liquid junction potential?

  • $\begingroup$ This is simply a variant of the well-known lemon cell, i.e., lemon ‘battery’. $\endgroup$
    – Ed V
    Nov 14, 2022 at 1:46
  • 1
    $\begingroup$ It is cell Zn/Zn^2+ H+/H2. Cu acts as pseudo inert electrode there. Cu^2+ would be reduced first, before H+, but there are no Cu^2+ ions. $\endgroup$
    – Poutnik
    Nov 14, 2022 at 5:55
  • $\begingroup$ "There are no Cu²+ ions." Does this mean double layer of Cu/ Cu²+ is negligible? It is little unconvincing, because Cu can dissolve in H2SO4 unlike pt/C $\endgroup$
    – Sudhagar
    Nov 14, 2022 at 16:00
  • $\begingroup$ Well...this notation apparently lacks symbols for junction potential/anode cathode separation etc... Is it possible to write like this? $\endgroup$
    – Sudhagar
    Nov 14, 2022 at 16:21


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.