3. Special Properties of Water (all result from hydrogen bonding)
Ice floats (maximum density of H2O at 4ºC)
High specific heat (amount of energy absorbed or released for a given change of temperature)
Similarly, high heat of melting & vaporization
Excellent solvent, especially for ionic or polar molecules.
Variations in [H+] greatly affect its chemical properties – acids vs. bases

4. Acids and Bases in Water
Acids add H+ to solution.
Bases remove H+ from solution.
The pH scale reflects the concentration of H+ in the solution. (pH = -log10[H+])
Pure water has pH 7 (neutral)
Acid solutions have pH less than 7
Basic (alkaline) solutions have pH > 7

6. Reading Assignments Chapter 1: read whole chapter for background
Chapter 2: pages (stop at “Buffers…”)
Chapter 3: read whole chapter but concentrate your study on topics covered in class. (For this chapter, if it wasn’t mentioned in class, it won’t be on a test.)