Question

Which is most acidic in its aqueous solution? a)FeCl3 b)AlCl3 c)NiCl3 d)BeCl2

Answer 1

Finding Ka values for these salts is difficult. Intuitively I would think AlCl3 would be more acidic; however, I found Ka for FeCl3 = 2E-3 and for AlCl3 = 1.2E-5. From that information FeCl3 is the stronger. I could find no information about BeCl2 or NiCl3. Sorry I can't be more definite. If you have Ka values for all of these hydrated salts, the strongest acid will be the one with the largest Ka value.

Answer 2

Thanks