This paper reports the reanalysis of precise conductance data for dilute aqueous solutions of magnesium sulphatk using the recently published Fuoss (F78) and Lee-Wheaton conductance equations. The value of ho so obtained is compared with the value obtained from a reanalysis of data for the unsymmetrical electrolytes magnesium chloride and sodium sulphate.

This paper reports precise conductance values for dilute (c 4 x mol dm-3) aqueous solutions of twenty-three 2 : 2 salts at 25 OC. Alkaline earth metal sulphates, thiosulphates, dithionates, tetrathionates, ethyl-, n-propyl-, n-butyl-disulphonates and acetylenedicarboxylates were studied. The results are analysed by means of the Lee-Wheaton conductance equation in terms of the limiting molar conductivity, Ao, the association constant, KA, and the association distance, R. The interpretation of these parameters is discussed and the values compared with previous work on these and similar systems.

New, precise data are reported for the conductivity of magnesium sulphate in water at 25 and 5 0 T . The data are analysed using the Pitts, Fuoss (1975) and Carman conductance equations and the Debye-Huckel and Glueckauf activity coefficient equations. The Fuoss (1975) equation combined with the Debye-Hiickel equation is found to give the best fit of the data, but only over a limited concentration range.