104A Sp09 lecture 10

104A Sp09 lecture 10 - Acid-Base Chemistry Reading Miessler...

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Acid-Base Chemistry Reading: Miessler and Tarr, Chap 6
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Proton AfFnities of Binary Hydrides -In general, as IE of molecule increases, PA decreases. -Group V binary hydrides do not follow trend - in their case IE doesn ʼ t vary as much as D(X + –H) PA (X) = D (X + -H) + IE (H) - IE (X)
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For the anions, differences in D (X + –H) are more substantial than differences in IE down a group, and differences in IE are more substantial than differences in D (X + –H) across a period. PA (X) = D (X + -H) + IE (H) - IE (X) Acidities of Binary Hydrides
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Br nsted Acids Aqua Acids: hydrated metal ions M(OH 2 ) n (aq) + H 2 O(l) [M(OH) (OH 2 ) n-1 ] + H 3 O + (aq) = z 2 d The higher the charge density of the metal ion, the greater its acidity - covalency also increases acidity electrostatic parameter charge M n+ radius + H 2 O diameter
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Hard-Soft Acid-Base Theories I) Ionic-Covalent Theory II) Electron Correlation Theory a) HA-HB interactions are primarily electrostatic (ionic), so they are favored by small
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104A Sp09 lecture 10 - Acid-Base Chemistry Reading Miessler...

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