The Properties of Water
Which Are Essential to the Maintenance of Life
I. Properties of water are dependent on hydrogen bonding
II. Properties of water
• A. Cohesion– 1. Definition– 2. Example
II. Properties of Water
• B. Adhesion– 1. definition– 2. example of old car hood
II. Properties of Water
• C. Surface tension– 1. Definition– 2. Example
Water strider on pond surface
D. Capillarity
• 1. Definition• 2. Example• 3. Importance
E. Specific heat
• 1. definition
• 2. specific heat of water is 1cal/gram/oC
• 3. specific heat of alcohol is .6cal/gram/oC
• 4. specific heat of water is 10X water
• 5. analogy of kids in mall
F. Heat of vaporization
• Definition
• Water has a heat of vaporization of 580 cal/gram
• Alcohol heat of vaporization is 290 cal/gram
G. Density changes with temperature• Definition of density
G. Density changes with temperature• Graph of density
changes
H. Water as a solvent of ionic molecules causes dissociation
H. Water also dissolves molecules which are hydrophilic almost irregardless of size
I. Water dissociates a little bit – very small percentage
1. At neutral pH the H2O H+ + OH-
• The concentration of hydrogen and hydroxyl ion are equal.
• The product of the two when multiplied together is always equal to 10-14
2. Acid
– a. definition– b. examples– c. what happens to relative concentration
of hydrogen and hydroxyl ion
3. Base
• a. definition
• b. examples
• c. what happens to hydrogen and hydroxyl ion concentrations
4. pH scale