PBi2, or Lead(II) iodide, is classified as a non-electrolyte. This classification comes from its solubility properties and how it behaves in solution.
An electrolyte is a substance that, when dissolved in water, dissociates into ions and can conduct electricity. Common examples of electrolytes include salts, acids, and bases. In contrast, a non-electrolyte does not dissociate into ions in solution, meaning it cannot conduct electricity.
PBi2 is poorly soluble in water. When it does dissolve, it does not break apart into lead and iodide ions. Instead, it tends to form a solid precipitate. This lack of dissociation means that it cannot provide free ions in solution, which are necessary for electrical conductivity.
In summary, due to its properties and behavior in water, PBi2 is considered a non-electrolyte because it does not produce ions that can carry an electric current.