Why Water is a Polar Molecule?

Water (H₂O) is essential to life and its polarity plays a vital role in its unique properties. Let’s explore step-by-step why water is a polar molecule.

✅ Understand the Atoms in Water

• Water is made of 2 hydrogen atoms and 1 oxygen atom.
• They are connected by covalent bonds (sharing of electrons).

✅ Consider Electronegativity

• Oxygen is more electronegative than hydrogen.
• It pulls the shared electrons closer to itself.
• This creates a partial negative charge (δ⁻) on oxygen and partial positive charges (δ⁺) on the hydrogens.

✅ Analyze the Molecular Shape

• Water has a bent (V-shaped) molecular geometry.
• The bond angle is approximately 104.5°, not a straight line.
• This shape prevents the partial charges from canceling out.

✅ Resulting Dipole Moment

• The molecule now has two poles — one side is δ⁻, the other is δ⁺.
• This separation of charges gives water a net dipole moment.

✅ So Water is a Polar Molecule

• Due to unequal electron sharing and bent shape,
• Water has opposite charges on opposite ends.
• Therefore, water is a polar molecule.

Source: NEXTPRAYAS