Activity coefficients for HCl in HCl + GaCl3 + H2O at eleven different temp
eratures from 5 to 55 degrees C have been determined at total experimental
ionic strengths from 0.01 to 3.0 mol-kg-l using a cell of the type:
Pt; H-2(g, 1 atm)\HCl(m(A)) + GaCl3(m(B))\AgCl, Ag (A)
The results for the 770 experimental emf data points have been used to dete
rmine the variation of the activity coefficients of HCl with the change in
molality of GaCl3 in the solution. It is found that the linear form of Harn
ed's rule is not obeyed for this system.