Question

Question #27e55

Answer 1

I'm afraid that more information is needed to answer the question. Here is just a brief example.

Explanation:

A half cell is a virtual concept to explain the principle of a chemical cell.

[Example] In a Daniel cell, you can think of the two isolated half cells.
(Anode) `Zn -> Zn^(2+) + 2e^-` (1)
(Cathode) `Cu^(2+) + 2e^-` `-> Cu` (2)

[How to connect?]
If you mean valancing the electron, just treat the equations like a simultaneous equation and erase `e^-`.

In the example shown above, just add (1) and (2) and you acquire
`Zn + Cu^(2+)` `-> Zn^(2+) + Cu`.

If you mean connecting the half cell physically, you need salt bridge. See the figure cited from https://en.wikipedia.org/wiki/Salt_bridge
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