1. 213 PHC

2. Acid-Base Equilibria (1)

3. By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids.  Calculate the pH of strong bases.

5. What is a pH scale? The pH of a solution was defined as: pH = - log [H + ] Similar definition is made for the [OH - ]: pOH = - log [OH - ]

6. pK w = pH + pOH  at 25 o C 14 = pH + pOH

7.  [H + ] = [OH - ]  the solution is neutral (pH=7).  [H + ]  [OH - ]  the solution is acidic (pH  7).  [H + ]  [OH - ]  the solution is alkaline (pH  7).

8. Calculation of pH and pOH of strong acids and bases page 224 225

9. Questions?

10. Summary  pH scale and definition.  pH and pOH of strong acids.  pH and pOH of strong bases.

11. Thank you