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Pharmaceutical Analytical Chemistry 2 nd lecture Dr. Mona AlShehri

213 PHC. Pharmaceutical Analytical Chemistry 2 nd lecture Dr. Mona AlShehri. Acid-Base Equilibria (1). (1) Gary D. Christian, Analytical Chemistry, 6 th edition. By the end of this lecture, you should be able to:. Define the pH of a solution. Calculate the pH of strong acids.

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Pharmaceutical Analytical Chemistry 2 nd lecture Dr. Mona AlShehri

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  1. 213 PHC Pharmaceutical Analytical Chemistry2ndlectureDr. Mona AlShehri

  2. Acid-Base Equilibria (1) (1) Gary D. Christian, Analytical Chemistry, 6th edition.

  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.

  4. The pH Scale

  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. pKw = pH + pOH at 25oC 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 basespage 224225

  9. Questions?

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

  11. Thank you

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