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
2ND LECTUREDR. MONA ALSHEHRI
213 PHC
(1 )GARY D. CHRISTIAN, ANALYTICAL CHEMISTRY, 6TH EDITION.
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. Calculate the pH of strong bases.
THE PH SCALE
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-]
pKw = pH + pOH
at 25oC
14 = pH + pOH
[H+] = [OH-] the solution is neutral (pH=7).
[H+] [OH-] the solution is acidic (pH 7).
[H+] [OH-] the solution is alkaline (pH 7).
Calculation of pH and pOH of strong acids and bases
page 224 225
Questions?
Summary
pH scale and definition. pH and pOH of strong acids. pH and pOH of strong bases.
Thank you
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