Question

What are conductivity cells?

Answer 1

Answer:

A conductivity cell is composed of two platinum electrodes which are coated with platinum black. The electrodes have area of cross section equal to A and are separated by distance ‘l’. Hence, the solution confined between the two electrodes is a column of length l and area of cross section A. The resistance for this column of solution is given by following equation.

R

=

ρ

l

A

=

l

κ

A

The quantity

l

A

is called cell constant and is denoted by the symbol G*.

G

⋅

=

l

A

=

R

κ

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