# Cell Notation

Generally a cell is represented as follows:

$M(s)M^{n+}_{(aq.)} || M^{n+}_{(aq.)} | M_1 (s)$

Certain notations have become fairly well known and are followed conventionally in connection with electrochemical cells. A half Cell such as Zn rod clipped in 0.1 M $Zn^{2+}$ ion solution is represented by $Zn / Zn^{2+}(0.1 M)$. The vertical line shows a solid phase.

Thus the Daniell cell may be represented as:

$Zn(s) | Zn^{++} (0.1M) || Cu^{2+} (0.1M) | Cu(s)$

Where two vertical lines indicate the salt bridge.

By convention, the anode of a cell is shown on the left in the cell notation.

Example.

Calculate the charge in coulomb on $C_2O^{2-}_4$ ion.

Solution:

Since $6.02 \times 10^{23}$ electrons correspond to 96500C

2 electrons present on a $C_2 O^{2-}_4$ ion will correspond to

$\dfrac{96500 \times 2}{6.02 \times 10^{23}} = 3.206 \times 10^{-19}C$

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