Give Arrhenius’s and Brønsted-Lowry definitions of acids and bases

Give Arrhenius’s and Brønsted-Lowry definitions of acids and bases

Answer all assigned questions and problems, and show all work. 1. List general properties of acids and bases. (See Section 4.3.) (2 points) 2. Give Arrhenius’s and Brønsted-Lowry definitions of acids and bases. (2 points) 3. Identify each of the following species as a Brønsted-Lowry acid, base, or both: (a) HI, (b) CH3COO– , (c) H2PO4 – , (d) HSO4 – . (2 points) 4. Balance the following equations d. HClO + CH3NH2 ⇌ CH3NH3 + + ClO– e. CO3 2– + H2O ⇌ HCO3 – + OH– (Reference: Chang 15.5) 6. Calculate the pH of each of the following solutions: (2 points) a. 0.0010 M HCl b. 0.76 M KOH (Reference: Chang 15.17) 7. Calculate the hydrogen ion concentration in mol/L for solutions with the following pH values: (4 points) a. 2.42 b. 11.21 c. 6.96 d. 15.00 (Reference: Chang 15.19) 8. How much NaOH (in grams) is needed to prepare 546 mL of solution with a pH of 10.00? (5 points) (Reference: Chang 15.25) 9. Classify each of the following species as a weak or strong acid: (9 points) a. HNO3 b. HF c. H2SO4 d. HSO4 – 2 Copyright © 2017 by Thomas Edison State University. All rights reserved. e. H2CO3 f. HCO3 – g. HCl h. HCN i. HNO2 (Reference: Chang 15.33) 10. Which of the following statements is/are true for a 0.10 M solution of a weak acid HA? (8 points) a. The pH is 1.00. b. [H+ ] ≫ [A– ] c. [H+ ] = [A– ] d. The pH is less than 1. (Reference: Chang 15.35) 11. The Ka for benzoic acid is 6.5 × 10–5 . Calculate the pH of a 0.10 M benzoic acid solution. (5 points) (Reference: Chang 15.43) 12. The pH of an acid solution is 6.20. Calculate the Ka for the acid. The initial acid concentration is 0.010 M. (5 points) (Reference: Chang 15.45) 13. Calculate the percent ionization of benzoic acid at the following concentrations: (8 points) 3 Copyright © 2017 by Thomas Edison State University. All rights reserved. a. 0.20 M b. 0.00020 M (Reference: Chang 15.47) 14. A 0.040 M solution of a monoprotic acid is 14 percent ionized. Calculate the ionization constant of the acid. (4 points) (Reference: Chang 15.49) 15. Calculate the pH for each of the following solutions: (8 points) a. 0.10 M NH3 b. 0.050 M C5H5N (pyridine) (Reference: Chang 15.55) 16. What is the original molarity of a solution of ammonia whose pH is 11.22? (4 points) (Reference: Chang 15.57) 17. Predict the acid strengths of the following compounds: H2O, H2S, and H2Se. (6 points) (Reference: Chang 15.67) 18. What is a salt? Define salt hydrolysis. Categorize salts according to how they affect the pH of a solution. (3 points) 4 Copyright © 2017 by Thomas Edison State University. All rights reserved. (Reference: Chang 15.73) 19. Calculate the pH of a 0.36 M CH3COONa solution. (5 points) (Reference: Chang 15.81) 20. Calculate the pH of a 0.42 M NH4Cl solution. (5 points) (Reference: Chang 15.82) 21. How many grams of NaCN would you need to dissolve in enough water to make exactly 250 mL of solution with a pH = 10.00? (5 points)


 

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