PO(OH)3 - Phosphoric acid - also H3PO4 :
First draw the Lewis dot structure:
Electron geometry: tetrahedral. Hybridization: sp3
Then draw the 3D molecular structure using VSEPR rules:
The molecular geometry of PO(OH)3 is tetrahedral with asymmetric charge distribution on the central atom.
Therefore this molecule is polar.
Phosphoric acid on Wikipedia.
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