Lec-34-Chap-16-2

# Lec-34-Chap-16-2 - pH Meter CHE 131 Lecture 34 Lewis Acids...

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CHE 131 Lecture 34 – Lewis Acids and Bases Chapter 16: pp. 800-802. pH Meter Photo by George Lisensky Fig. 16-3, p.778 Fig. 16-4, p.778

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p.778 Acid Dissociation Constant HC 2 H 3 O 2 + H 2 O Ù H 3 O + + C 2 H 3 O 2 - [H 3 O + ][C 2 H 3 O 2 - ] K = [H 2 O][HC 2 H 3 O 2 ] [H 3 O + ][C 2 H 3 O 2 - ] K a = K × [H 2 O] = [HC 2 H 3 O 2 ] Ionization Constants for Acids EXAMPLE: Calculate the [H 3 O + ] in an aqueous 0.140 M acetic acid solution. HC 2 H 3 O 2 + H 2 O Ù H 3 O + + C 2 H 3 O 2 -
EXAMPLE: Calculate the [H 3 O + ] in an aqueous 0.140 M acetic acid solution. EXAMPLE: A saturated aqueous solution of caproic acid contains 11 g/L and has a pH = 2.94 . What is its K a ? HC 6 H 11 O 2 + H 2 O Ù H 3 O + + C 6 H 11 O 2 - EXAMPLE: A saturated aqueous solution of caproic acid contains 11 g/L and has a pH = 2.94 . What is its K a ? Influence of Molecular Structure on Acid Strength Binary Hydrides • Bond Strengths – weaker the bond, the stronger the acid • Stability of Anion – higher the electronegativity, stronger the acid

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Lec-34-Chap-16-2 - pH Meter CHE 131 Lecture 34 Lewis Acids...

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