Calculate ionic strength, mean ionic activity coefficient Y, and the mean ionic molality m for a 0.02 molal aqueous solution of zinc chloride, ZnCl2.
Zinc chloride will dissolve as:
ZnCl2 → Zn2+(aq) + 2Cl-(aq)
The concentrations of the zinc and chloride ions will then be 0.02 and 0.04 molal, respectively.
The mean ionic molality is defined as the average molality of the two ions: