2010-02-22 - Problem Set _9 - Weak Acids and Bases

2010-02-22 - Problem Set _9 - Weak Acids and Bases -...

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Problem Set #9 – Weak Acids and Bases Use the data in Tables 10.1, 10.2, and 10.3 in your notes as needed. 1. Give the K a value for each acid and list the acids in order of strength: H 3 PO 4 , pK a1 = 2.12; H 3 PO 3 , pK a1 = 2.00; H 2 SeO 3 , pK a1 = 2.46; HSeO 4 - , pK a2 = 1.92 2. Write the proton transfer equilibrium equation for HClO 2 and the expression for K a . Identify its conjugate base, write the proton transfer equation for this base, and write the expression for its K b . 3. Place the following acids in order of increasing strength: HNO 2 , HClO 2 , + NH 3 OH, (CH 3 ) 2 NH 2 + 4. Place the following bases in order of increasing strength: F - , NH 3 , CH 3 CO 2 - , C 5 H 5 N 5. Is the acid strong or weak? Refer to tables 10.1, 10.2, and 10.3 in the text as needed. (a) HClO 3 , (b) H 2 S, (c) HSO 4 - , (d) CH 3 NH 3 + , (e) HCO 3 - , (f) HNO 3 , (g) CH 4 6. The pK a of HIO is 10.64 and that of HIO 3 is 0.77. What accounts for this difference? 7.
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This note was uploaded on 03/01/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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