Ionic Equilibria in Aqueous Solutions of the Chlorides of Magnesium, Calcium, Strontium and Barium

The e.m.f. of the cells of the type, \(Hg|\begin{smallmatrix} Hg_2Cl_2 HCl&(c_1) \\ MCl_2&(c_2) \end{smallmatrix} \bigr|\)\(\begin{smallmatrix} HCl&(c_1) \\ MCl_2&(c_2) \end{smallmatrix} \bigr|\)\(\begin{smallmatrix} HCl (c_1)&Q.H. \\ MCl_2 (c_2) \end{smallmatrix} \bigr| Pt\) where M stands for Mg, Ca, Sr or Ba have been measured at one or more temperatures and compared with the values calculated on the basis of complete dissociation of MCl2. The difference is so small (some times even less than 0·1 mv) that we may safely conclude that the salts are completely dissociated in solutions having ionic strength upto 0·1