Question

What is transport number and abnormal transport number?

Answer 1

Ion transport number. Ion transport number, also called the transference number, is the fraction of the total electrical current carried in an electrolyte by a given ionic species , Differences in transport number arise from differences in electrical mobility.

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Answer 2

Explanation:

The fraction of total electric current carried by the ions or ionic species present in an electrolyte is known as transport number.

Mathematically,  transport no. for cation = $\frac{v^{+}}{v^{+} + V^{-}}$

where,     $v^{+}$ = speed of migration of cation

               $v^{-}$ = speed of migration of anion

and,    $v^{+}$ + $v^{-}$ = 1 always

A transport number must lie between 0 and 1 otherwise, it means that the positive ion is moving against the current or the negative ion against the current.

This abnormal behavior of the ions is known as abnormal transport number.