Ch17_Struct_7 - Why? • Why are some • Why are some...

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Unformatted text preview: Why? • Why are some • Why are some compounds acids? compounds acids? • Why are some • Why are some compounds bases? compounds bases? • Why do acids and bases • Why do acids and bases vary in strength? vary in strength? • Can we predict • Can we predict variations in acidity or variations in acidity or basicity ? basicity? Acetic acid (-) (+) Partial Partial charges charges (+) 1. The electronegativity of the O atoms causes the H attached to O to be highly positive. 2. The O—H bond is highly polar. 3. The H atom of O—H is readily attracted to polar H2O. (-) Basicity of Oxoanions of Oxoanions NO3CO32- PO43These ions are BASES. These BASES. They become more and more basic as the negative charge increases. As the charge goes up, they interact more strongly with polar water molecules. Page 1 Acetic acid Ka = 1.8 x 10 -5 Trichloroacetic acid Ka = 0.3 Trichloroacetic acid is much stronger acid owing to the high electronegativity of Cl, which withdraws electrons from the rest of the molecule. This makes the O—H bond highly polar. The H of O—H is very positive. ...
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This note was uploaded on 10/19/2011 for the course CHM 2210 taught by Professor Mcquade during the Fall '08 term at FSU.

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