Chem1b-E2-Prac

Chem1b-E2-Prac - Chapter 17 Principles or Reactivity The...

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166 Chapter 17 Principles or Reactivity: The Chemistry of Acids and Bases 1. According to the Brønsted-Lowry definition, an acid a) increases the H 3 O + concentration in a solution. b) increases the OH - concentration in a solution. c) is a proton donor. d) is a proton acceptor. e) has a lone pair of electrons that can bond to a proton. Answer: c 2. According to the Brønsted-Lowry definition, a base a) increases the H 3 O + concentration in a solution. b) increases the OH - concentration in a solution. c) is a proton donor. d) is a proton acceptor. e) has a lone pair of electrons that can bond to a proton. Answer: d 3. Acids that ionize extensively in solution are referred to as a) strong acids. b) weak acids. c) Arrhenius acids. d) Brønsted-Lowry acids. e) amphiprotic. Answer: a 4. All of the following are strong acids EXCEPT a) HCl b) HNO 3 c) HClO 4 d) H 2 SO 4 e) H 3 PO 4 Answer: e 5. All of the following are weak acids EXCEPT a) HF b) CH 3 CO 2 H c) HBr d) NH 4 + e) HCN Answer: c 6. All of the following are weak bases EXCEPT a) NH 3 b) Ba(OH) 2 c) CH 3 2 - d) F - e) HCO 3 - Answer: b
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167 7. In the following reaction H 2 S(aq) + H 2 O( l ) & HS - (aq) + H 3 O + (aq) a) H 2 O is an acid and H 2 S is its conjugate base. b) H 2 S is an acid and H 2 O is its conjugate base. c) H 2 O is an acid and H 3 O + is its conjugate base. d) H 2 S is an acid and HS - is its conjugate base. e) H 3 O + is an acid and HS - is its conjugate base. Answer: d 8. In the following reaction HCO 3 - (aq) + NH 3 (aq) & CO 3 2- (aq) + NH 4 + (aq) a) HCO 3 - is an acid and NH 3 (aq) is its conjugate base. b) HCO 3 - is an acid and CO 3 2- is its conjugate base. c) NH 3 is an acid and HCO 3 2- is its conjugate base. d) NH 3 is an acid and NH 4 + is its conjugate base. e) NH 4 + is an acid and CO 3 2- is its conjugate base. Answer: b 9. The conjugate acid of OH - is a) H 3 O + b) H 2 O c) OH - d) O e) H - Answer: b 10. The conjugate base of NH 3 a) OH - b) H 2 c) H 3 O + d) NH 4 + e) NH 2 - Answer: e 11. What is the conjugate acid of HPO 4 2- (aq)? a) H 3 PO 4 b) H 2 PO 4 - c) PO 4 2- d) H 3 O + e) OH - Answer: b 12. Which acid is a potentially dangerous component of rhubarb leaves? a) hydrochloric b) phosphoric c) acetic d) oxalic e) selenic Answer: d 13. All of the following ions are amphiprotic EXCEPT a) HPO 4 b) H 2 PO 4 - c) HCO 3 - d) HS - e) CH 3 2 - Answer: e
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168 14. Molecules or ions that can behave as either a Brønsted-Lowry acid or base are called a) amphiprotic. b) hydronium. c) polyprotic acids or bases. d) conjugate acids or bases. e) weak electrolytes. Answer: a 15. At 10 ° C, the water ionization constant, K w , is 2.9 × 10 -15 . What is the H 3 O + concentration in neutral water at this temperature? a) 2.9 × 10 -15 M b)1.4 × 10 -15 M c) 3.8 × 10 -8 M d) 5.4 × 10 e) 1.0 × 10 -7 M Answer: d 16. A solution is prepared by diluting 0.25 mol HNO 3 to a volume of 750 mL. What is the pH of this solution? a) 0.33 b) 0.48 c) 0.60 d) 3.5 e) 4.2 Answer: b 17. At 298 K, what is the H 3 O + concentration of a solution with a OH - concentration of 2.88 × 10 -2 M?
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This note was uploaded on 10/27/2010 for the course CHEM 337 taught by Professor Kim during the Fall '10 term at CSU Sacramento.

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Chem1b-E2-Prac - Chapter 17 Principles or Reactivity The...

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