213 phc. acid-base equilibria (1) by the end of this lecture, you should be able to: define the ph...

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PHARMACEUTICAL ANALYTICAL CHEMISTRY 2 ND LECTURE DR. MONA ALSHEHRI 213 PHC

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Page 1: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

PHARMACEUTICAL ANALYTICAL CHEMISTRY

2ND LECTUREDR. MONA ALSHEHRI

213 PHC

Page 2: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

(1 )GARY D. CHRISTIAN, ANALYTICAL CHEMISTRY, 6TH EDITION.

Acid-Base Equilibria (1)

Page 3: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

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.

Page 4: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

THE PH SCALE

Page 5: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

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-]

Page 6: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

pKw = pH + pOH

at 25oC

14 = pH + pOH

Page 7: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

[H+] = [OH-] the solution is neutral (pH=7).

[H+] [OH-] the solution is acidic (pH 7).

[H+] [OH-] the solution is alkaline (pH 7).

Page 8: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

Calculation of pH and pOH of strong acids and bases

page 224 225

Page 9: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

Questions?

Page 10: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

Summary

pH scale and definition. pH and pOH of strong acids. pH and pOH of strong bases.

Page 11: 213 PHC. Acid-Base Equilibria (1) By the end of this lecture, you should be able to:  Define the pH of a solution.  Calculate the pH of strong acids

Thank you