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