Transport Numbers and Liquid Junction Potentials

4 Transport Numbers and Liquid Junction Potentials Problem 

A liquid junction potential arises at the interface because in the case that r+ r, the different rates of diffusion of the two ions from high to low concentration generates a charge separation at the interface and hence a potential difference known as a liquid junction potential, ljp- According to the classical theory of liquid junction potentials [P. Henderson, Z. PhysiL Chem. 59 (1907) 118], for a salt and X , this has a limiting magnitude of 

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