Hydrogen Bonding

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•  Hydrogen bonding and dipolarity explain the cohesive, adhesive, thermal and solvent properties of water

The dipolarity of a water molecule enables it to form polar associations with other charged molecules (polar or ionic)

Water can form hydrogen bonds with other water molecules (between a δ+ hydrogen and a δ oxygen of two molecules)

Hydrogen Bonding between Water Molecules

hydrogen bonding

Properties of Water

This intermolecular bonding between water molecules gives water distinct properties not seen in other substances:

  • Thermal properties – Water can absorb much heat before changing state (requires breaking of hydrogen bonds)
  • Cohesive / adhesive properties – Water will ‘stick’ to other water molecules (cohesion) and charged substances (adhesion)
  • Solvent properties – Water dissolves polar and ionic substances (forms competing polar associations to draw materials apart)