Chapter 16, Problem 72E

In the following reactions indicate which is the Lewis acid and which is the Lewis base:

(a) ${\text{SOI}}_{\text{2}}{\text{+BaSO}}_{\text{3}}\to {\text{Ba}}^{\text{2+}}{\text{2I}}^{\text{-}}{\text{+2SO}}_{\text{2}}$

(b) ${\text{HgCL}}_3^{-}+{\text{CL}}^{-}\to {\text{HgCL}}_{\text{4}}^{\text{2-}}$