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HW 5-CB-key

# HW 5-CB-key - Sessler CH310M/318M Homework Problem Set 5...

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Sessler CH310M/318M Homework Problem Set 5 Due Friday, March, 4, 2011 1 Circle the section in which you are enrolled: 310M 318M Please write the first three letters of your last name in the above boxes Name:_______________________________ UT EID:_____________________________ Signature:____________________________ Grade ( + / - / 0 ):______________________

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Sessler CH310M/318M Homework Problem Set 5 Due Friday, March, 4, 2011 2 1. Draw an arrow under each acid-base reaction showing the dominant direction of equilibrium. 2. Calculate the equilibrium constant for the following acid-base reaction. The pK a of trifluoroacetic acid is 0.5. The pK a of the protonated pyridine is 5.21. Show all calculations. pK eq = reactant – product = 0.5-5.21 = -4.71 antilog of –(-4.71 )= 5.1 x 10 4 K eq = 5.1 x 10 4 F F F O OH N F F F O O N H H 3 C CH 3 O H 3 C CH 2 O NaNH 2 NH 3 pKa = 19.3 pKa = 38 H 3 C CH 3 O O H H 3 C CH 3 O H 3 C CH 3 O O H 3 C CH 2 O H H pKa = 19.3 pKa = 9
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HW 5-CB-key - Sessler CH310M/318M Homework Problem Set 5...

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