Properties of Water

Learning Objectives  Discuss the unique properties of water.  Differentiate between solutions and suspensions.  Explain what acidic solutions and basic solutions are.

The Water Molecule Water molecules are polar; the charges are unevenly distributed in the molecule. (-) (+)

Hydrogen Bonding Hydrogen bond

Cohesion Cohesion: attraction between molecules of the same substance

Adhesion and Heat Capacity Adhesion: attraction between molecules of different substances Heat capacity: amount of heat it takes to raise temperature Meniscus

Solutions and Suspensions Water’s polarity gives it the ability to dissolve both ionic compounds and other polar molecules.

Acids, Bases, and pH Low pH = acidic; higher concentration of H + High pH = basic; lower concentration of H + Pure water Human blood Stomach acid

Buffers Buffers help maintain homeostasis in organisms. Base Neutral Acid Unbuffered base + acid = _________ Buffered base + acid = ________ acidic pH basic pH

Student Worksheet Answers