Properties of Water

1
Properties of Water
2
Hydrogen bonding
3
Surface tension
4
Ice, water, vapor
5
Hydrogen bonding (electric attraction)
Ice
Liquid
6
Water-soluble protein
7
Dissociation of water
8
pH
H 10-1M
pH log H
Log scale means 10X change per unit!
H 10-9 M
9
Buffers

• Buffers resist changes to the pH of a solution
  when H or OH- is added to the solution.
• Buffers accept hydrogen ions from the solution
  when they are in excess and donate hydrogen ions
  when they have been depleted.

10
Overall lessons

• Many properties of water are emergent properties
  due to hydrogen bonding.
• The cohesion of water molecules to each other is
  exploited by plants and animals.
• Water resists temperature changes by absorbing
  lots of heat.
• Lower density of ice causes it to float
  insulate the water below.
• The polarity of water allows it to dissolve other
  polar molecules.
• Non-polar compounds are hydrophobic and not
  easily dissolved in water.
• A mole of a compound has a constant of
  molecules.
• Adding or removing hydrogen ions changes the pH
  of a solution.
• Buffers resist pH changes by accepting or
  donating H ions when H changes.