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Question 20 Calculate the percentage of pyridine (CSH5N) that forms pyridinium ion, C,H¢N*, in a 0.89 M aqueous solution of pyridine (K, = 1.7 x 10-9). a) 1.7 x 10-7% b) 3.9 x 10-3% c) 1.9 x 10-7% d) 4.9 x 10-3% 9. e) 4.4 x 10-3%

Question 20 Calculate the percentage of pyridine (CSH5N) that forms pyridinium ion, C,H¢N*, in a 0.89 M aqueous solution of pyridine (K, = 1.7 x 10-9). a) 1.7 x 10-7% b) 3.9 x 10-3% c) 1.9 x 10-7% d) 4.9 x 10-3% 9. e) 4.4 x 10-3%

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ISBN:9781305957404
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Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Question 20 Calculate the percentage of pyridine (C5H5N) that forms pyridinium ion, CsH&N*, in a 0.89 M aqueous solution of pyridine (Kp = 1.7 x 10-9). a) 1.7 x 10-7% b) 3.9 x 10-3% c) 1.9 x 10-7% d) 4.9 x 10-3% 9 e) 4.4 x 10-39% Question 21 A 0.28 mol sample of diprotic acid, H2A, is dissolved in 250 mL of water. The Kat of this acid is 1.0 x 10-5 and K2 is 1.0 x 10-10. Calculate the concentration of A? in this solution. a) 1.0 x 10-5 M b) 1.7 x 10-3 M c) 3.3 x 10-3 M d) 1.0 x 10-10 M e) 1.12 M Question 22 In the reaction: CuO(s) + CO2(g) CUCO3(s) a) Cu2* acts as a Lewis acid and CO32- acts as a Lewis base. b) 02 acts as a Lewis base and CO2 acts as a Lewis acid. c) 02 acts as a Lewis base and Cu2+ acts as a Lewis acid. d) Cuo is the Lewis acid and CUCO3 is its conjugate base. e) CO2 is the Lewis acid and CUCO3 is its Lewis base.
Transcribed Image Text:Question 20 Calculate the percentage of pyridine (C5H5N) that forms pyridinium ion, CsH&N*, in a 0.89 M aqueous solution of pyridine (Kp = 1.7 x 10-9). a) 1.7 x 10-7% b) 3.9 x 10-3% c) 1.9 x 10-7% d) 4.9 x 10-3% 9 e) 4.4 x 10-39% Question 21 A 0.28 mol sample of diprotic acid, H2A, is dissolved in 250 mL of water. The Kat of this acid is 1.0 x 10-5 and K2 is 1.0 x 10-10. Calculate the concentration of A? in this solution. a) 1.0 x 10-5 M b) 1.7 x 10-3 M c) 3.3 x 10-3 M d) 1.0 x 10-10 M e) 1.12 M Question 22 In the reaction: CuO(s) + CO2(g) CUCO3(s) a) Cu2* acts as a Lewis acid and CO32- acts as a Lewis base. b) 02 acts as a Lewis base and CO2 acts as a Lewis acid. c) 02 acts as a Lewis base and Cu2+ acts as a Lewis acid. d) Cuo is the Lewis acid and CUCO3 is its conjugate base. e) CO2 is the Lewis acid and CUCO3 is its Lewis base.
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