Exam 1 - CHM 2046 EXAM 1 FORM CODE A Please bubble in your...

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CHM 2046 EXAM 1 FORM CODE A 1/26/2009 1. What is the conjugate base of CH 3 COOH? (a) CH 3 COO - (b) CH 3 COOH 2 (c) CH 2 COOH (d) CH 2 COO - (e) CH 3 COO + 2. A Brønsted base is defined as a compound that is capable of. . . (a) donating a proton (b) accepting a proton (c) donating a neutron (d) accepting an electron (e) donating an electron 3. Which is not a strong acid? 4. Having an extremely large equilibrium constant, K, indicates that a reaction. . . 5. Calculate the pH of a 0.04 M KOH solution. 6. Without doing any explicit calculations, rank the following solutions in terms of increasing pH: 0.01M HNO 2 0.1 M KBr 0.1 M HNO 2 0.1 M KOH 0.01 M KOH 0.01 M NH 3 0.1 M HNO 3 Lowest pH Highest pH (a) 0.01 M KOH, 0.1 M KOH, 0.1 M KBr, 0.01 M NH 3 , 0.01 M HNO 2 , 0.1 M HNO 2 , 0.1 M HNO 3 (b) 0.1 M KOH, 0.01 M KOH, 0.01 M NH 3 , 0.1 M KBr, 0.01 M HNO 2 , 0.1 M HNO 2 , 0.1 M HNO 3 (c) 0.1 M HNO 3 , 0.1 M HNO 2 , 0.01 M HNO 2 , 0.1 M KBr, 0.01 M NH 3 , 0.01 M KOH, 0.1 M KOH (d) 0.1 M HNO 3 , 0.1 M HNO 2 , 0.01 M HNO 2 , 0.01 M NH 3 , 0.1 M KBr, 0.1 M KOH, 0.01 M KOH (e) 0.01 M KOH, 0.1 M KOH, 0.1 M KBr, 0.01 M NH 3 , 0.1 M HNO 3 , 0.01 M HNO 2 , 0.1 M HNO 2 7. What is the equilibrium constant, K, for the following reaction? CaCO 3 (s) + H 2 O(l) Ca 2+ (aq) + HCO 3 - (aq) + HO - (aq) [CaCO 3 ][H 2 O] [CaCO 3 ] [CaCO 3 ] 8. Which of the following is not a Brønsted base? 9. To synthesize the compound Cr(DPPZ)Cl 3 dmf, you must dissolve dipyridophenozine (DPPZ) and CrCl 3 ·6H 2 O into hot N,N-dimethylformamide (dmf) resulting in the following reaction: CrCl 3 ·6H 2 O(sol) + DPPZ(sol) + dmf(l) Cr(DPPZ)Cl 3 dmf(s) + 6H 2 O(sol) Note that “compound(sol)” indicates that the compound is dissolved in the solvent dmf. What is the equilibrium constant expression for this reaction?
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