Transference Numbers in the H2O + NaCl + MgCl2 System at T = 298.15 K,Determined in a Five-Compartment Hittorf Cell

The concentration range of transference number measurements with the Hittorf cell has been extended up to a total concentration of c _T = 3.4 mol·dm^?3 for the H₂O + NaCl + MgCl₂ ternary system at (298.15 ± 0.05) °C. This was achieved with a redesigned Hittorf cell, by dividing each of the anodic/cathodic compartments into two subcompartments: one with a low concentration of H₂O + NaCl for the electrode reaction and another one in contact with the middle compartment with the ternary solution to be measured. Measurements of the transference numbers were also made for the corresponding H₂O + NaCl and H₂O + MgCl₂ binary systems. The experimental details and the results are described.