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