# Question #27e55

Oct 10, 2017

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) $Z n \to Z {n}^{2 +} + 2 {e}^{-}$ (1)
(Cathode) $C {u}^{2 +} + 2 {e}^{-}$ $\to C u$ (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
$Z n + C {u}^{2 +}$ $\to Z {n}^{2 +} + C u$.

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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