Question

Why are i3- and i3+ ions considered as polar species.

Answer 1

Answer:

As I3- has one electron, this Ion has a negative charge overall. Molecules have polarity because it has both the charges that are a partially positively charged end and the partially negatively charged end. So it is neither polar or nonpolar.

Answer 2

$I_3^-$ is linear in shape but $I_3^+$ is bent.

• The species which exhibit dipole moment are considered polar.
• $I_3^-$ is linear in shape but $I_3^+$ is bent.
• Thus in linear triiodide anion, the dipole moment works from iodine to iodine ion. Thus, the molecule is polar.
• Again in bent triiodide cation, the dipole moment works from positive iodine to iodine atom. Thus, the molecule is also polar.