When temperature is increased the transport number of cation and anion approach a valu of.....
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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 {\displaystyle i}i,
{\displaystyle t_{i}={\frac {I_{i}}{I_{tot}}}}{\displaystyle t_{i}={\frac {I_{i}}{I_{tot}}}}
Differences in transport number arise from differences in electrical mobility. For example, in an aqueous solution of sodium chloride, less than half of the current is carried by the positively charged sodium ions (cations) and more than half is carried by the negatively charged chloride ions (anions) because the chloride ions are able to move faster, i.e., chloride ions have higher mobility than sodium ions. The sum of the transport numbers for all of the ions in solution always equals unity