Thermodynamic studies of cadmium sulphate in aqueous mannitol from electromotive force measurements

The standard molal potentials (E-m(theta)) of the cell, Cd . Hg 1 CdSO4 (m) , mannitol (x) I Hg2SO4 (s) I Hg, have been determined in water and 5, 15 a nd 25% aqueous mannitol solutions at five different temperatures (298-318 K ) and molality of cadmium sulphate ranged from 0.01 to 0.1 mol kg(-1) Mean molal activity coefficients at 298 ki are calculated. The temperature varia tion of the standard e.m.f. is used to calculate the standard thermodynamic functions (Delta G(theta)) the cell reaction. The primary medium effect of different solvents upon cadmium sulphate and standard quantities of transf er for cadmium sulphate from the standard state in vt ater to that in the r espective aqueous mannitol solutions are also calculated.