Abstract:
The e.m.f. of the cell Ag, AgCl | CaCl2(/Hi), CaSO4(/n2) | Ca-cxchange membrane | CaCl2(0.1 mol
kg-1) | AgCl, Ag has been determined at 25,40 and 50°C. Errors associated with drifting of the calcium
ion-exchange electrode have been minimised by using a rapid method to determine E& and the
Nernstian slope factor of the electrode pair before determining the e.m.f. of the above cell. The data
were used to calculate values of the thermodynamic quantities Kd, AGO, A//O, ASO and ACO for
the dissociation of the CaSO4 ion-pair.
