Chapter 13, Problem 13.114QP

Iodine (I₂) is only sparingly soluble in water (left photo). Yet upon the addition of iodide ions (e.g., from KI), iodine is converted to the triiodide ion, which readily dissolves (right photo).

${\text{I}}_{\text{2}}\text{(}s{\text{) + I}}^{-}\text{(}aq\text{) }\rightleftarrows {\text{ I}}_3^{-}\text{(}aq\text{)}$

Describe the change m solubility of I₂ in terms of the change in intermolecular forces.