When a dilute aqueous solution of is added to a volumetric excess of dilute solution, a stable lyoph — Surface Chemistry Chemistry Question

💡 Solution & Explanation

In the presence of excess $KI$, the common iodide ion ($I^-$) is preferentially adsorbed onto the $AgI$ crystal lattice, forming a negatively charged primary layer. The highly mobile $K^+$ ions form the diffuse secondary layer in the medium, yielding the structure $[AgI] / I^- \vdots K^+$.