CHEM302 S09 CA1A key

CHEM302 S09 CA1A key - CHEM302, Spring 2009 Dr. Ruder 1...

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CHEM302, Spring 2009 Dr. Ruder 1 Class Activity 1A Alcohols: Versatile Reagents Part A: General reactions as acids, bases, nucleophiles and electrophiles. Model 1: General Acid / Base reaction + A H A B H B + acid base Questions: 1. In Model 1, label the conjugate acid and conjugate base. 2. In Model 1, what happens to the acid in terms of proton loss or gain? The acid donates a proton. 3. In Model 1, what happens to the base in terms of proton loss or gain? The base accepts a proton. 4. Look carefully at the curved arrows in Model 1. a. What happens to the acid in terms of loss or gain of an electron pair? The acid accepts an electron pair. b. What happens to the base in terms of loss or gain of an electron pair? The base donates an electron pair. Model 2: Alcohols as acids or bases H R O H + R O H H HO R O H + HOH + RO + HOH O H H Questions: 5. Using the information about pKa values above, would you expect an alcohol to be a strong acid, strong base or neither of these? The alcohol is neither a strong base or a strong acid because the pKa = 15, or too high for a strong acid and too low for a strong base. 6 . In Model 2 label each species as either acid, base, conjugate acid or conjugate base. Each species should have one label. 7. In Model 2, draw curved arrows to indicate electron movement for each reaction. Review Information: The pKa of a strong acid is <5 The pKa of a strong base is >30 The pKa of an alcohol is around 15
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CHEM302, Spring 2009 Dr. Ruder 2 8. Draw the products of the following reaction, and identify each species as either acid, base, conjugate acid or conjugate base. H
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This note was uploaded on 02/17/2011 for the course CHEM 301 taught by Professor Sahli during the Fall '07 term at VCU.

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CHEM302 S09 CA1A key - CHEM302, Spring 2009 Dr. Ruder 1...

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