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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? basicity? Acetic acid (-) (+) Partial charges (+) (-) 1. The electroelectronegativity 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. Acetic acid Ka = 1.8 x 10 -5 1.8 Trichloroacetic acid Ka = 0.3 0.3 Trichloroacetic acid is much stronger acid owing to the high electronegativity of Cl, 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. Basicity of Oxoanions Oxoanions NO3PO43These ions are BASES. 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. CO32- Page 1 ...
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This note was uploaded on 01/11/2011 for the course ENGINEERIN MAE 107 taught by Professor Pozikrizdis during the Fall '08 term at San Diego.
- Fall '08