Chapter 12, Problem 12.102QP

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

${\text{I}}_{\text{2}}(s)+{\text{I}}^{-}(aq)\stackrel{}{\rightleftharpoons }{\text{I}}_{\text{3}}^{-}(aq)$

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

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