Chapter 15A TAVSS

Chapter 15A TAVSS - CHAPTER 15A ACID BASE EQUILIBRIA...

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CHAPTER 15A Problems to prepare students for hourly exam II. Acid and base concepts Acid and base equilibria calculations Salt equilibria concepts/calculations Relationship between acid and base structure and strength E. Tavss 4/23/06 1
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ACID AND BASE CONCEPTS CHEM162-2003 5 TH WEEK RECITATION CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS 123 Identify the Lewis acid and the Lewis base in each of the following reactions. a. B(OH) 3 (aq) + H 2 O(l) Br(OH) 4 - (aq) + H + (aq) LA LB b. Ag + (aq) + 2NH 3 (aq) Ag(NH 3 ) 2 + (aq) LA LB c. BF 3 (g) + F - (aq) BF 4 - (aq) LA LB 2
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2. CHEM162-2000 HOURLY EXAM II CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS Which of the following species is/are amphiprotic? X. H 2 CO 3 Y. HCO 3 - Z. CO 3 2 - A. X and Y only B. Z only C . Y only D. Y and Z only E. X, Y, and Z 13. CHEM162-2000 HOURLY EXAM II CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS Phosphoric acid, H 3 PO 4 , is a polyprotic acid. Which one of the following equations has an equilibrium constant that would be designated as K a2 for phosphoric acid? A. H 3 PO 4 (aq) + H 2 O( l ) H 3 O + (aq) + H 2 PO 4 - (aq) B . H 2 PO 4 - (aq) + H 2 O( l ) H 3 O + (aq) + HPO 4 2- (aq) C. H 2 PO 4 - (aq) + H 2 O( l ) H 3 PO 4 (aq) + OH - (aq) D. H 3 PO 4 (aq) + OH - (aq) H 2 PO 4 - (aq) + H 2 O( l ) E. HPO 4 2- (aq) + H 2 O( l ) H 3 O + (aq) + PO 4 3 - (aq) 21. CHEM162-2000 HOURLY EXAM II CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS Consider two acids: HClO 2 K a = 1.0 x 10 -2 HClO K a = 3.0 x 10 -8 3
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X. K b for ClO 2 - is greater than K b for ClO - . Y. 0.10 M HClO 2 has a higher pH than 0.10 M HClO. Z. 1.0 mol of each acid would require the same amount of NaOH to reach the stoichiometric point. A. X only B. Y only C. X and Z only D. Y and Z only E . Z only CHEM162-2002 HOURLY EXAM II + ANSWERS CHAPTER 14 - ACID AND BASE EQUILIBRIA ACID AND BASE EQUILIBRIA CONCEPTS 6. HX is a weak acid with pKa = 6.0. Which of the following reactions would have a large value for its equilibrium constant? W. HX+OH - H 2 O+X - Reactions of strong bases with weak (or strong) acids, and reactions of strong acids with weak (or strong) bases, go virtually to completion, yielding a correspondingly large value for its equilibrium constant. X. HX+H 2 O H 3 O + + X - Hydrolysis of weak acids or weak bases yield a very small equilibrium constant. Y. X - +H 2 O HX + OH - Hydrolysis of weak acids or weak bases yield a very small equilibrium constant. Z. X - +H 3 O + HX + H 2 O Reactions of strong bases with weak (or strong) acids, and reactions of strong acids with weak (or strong) bases, go virtually to completion, yielding a correspondingly large value for its equilibrium constant. A.
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Chapter 15A TAVSS - CHAPTER 15A ACID BASE EQUILIBRIA...

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