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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