ex2 - CHEMISTRY 13 EXAM 2 FEBRUARY 28, 2006 FORM A 1. A...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CHEMISTRY 13 EXAM 2 FEBRUARY 28, 2006 FORM A 1. A 0.0112M solution of aspirin (acetylsalicylic acid) has a pH at 25 C of 2.76. What is the K a of aspirin? A. 2.82 10 5 B. 3.02 10 6 C. 3.31 10 9 D. 3.19 10 4 E. 1.74 10 3------------------------------------------------------------------------------------------------- 2. What is the pH of a 0.50 M solution of NH 4 Cl? (K b for NH 3 = 1.8 x 10 5 ) A. 9.6 B. 11.5 C. 2.5 D. 5.1 E. 4.8 ------------------------------------------------------------------------------------------------- 3. At body temperature (T =37 C) the pH of pure water is 6.80. What is K w at 37 C? A. 1.00 10 14 B. 1.58 10 14 C. 3.98 10 15 D. 1.58 10 7 E. 2.51 10 14------------------------------------------------------------------------------------------------- 4. Pick the strongest base from the following list. A. PO 4 3 (H 3 PO 4 : K a1 = 7.5 10 3 , K a2 = 6.2 10 8 , K a3 = 4.2 10 13 ) B. NH 3 (K b = 1.8 10 5 ) C. N 3 (K a for HN 3 = 1.9 10 5 ) D. NO 3 E. F (K a for HF = 6.6 10 4 ) ------------------------------------------------------------------------------------------------- 5. The pH of a solution of ammonia, NH 3 , is measured at equilibrium and found to be 11.48. Given that K b for NH 3 is 1.8 10 5 , the initial (before equilibrium) concentration of NH 3 was A. 2.4 10 1 M B. 1.0 10 1 M C. 0.51 M D. 1.0 M E. 5.6 10 10 M ------------------------------------------------------------------------------------------------- 6. Which one of the following solutions will be the most acidic?...
View Full Document

Page1 / 7

ex2 - CHEMISTRY 13 EXAM 2 FEBRUARY 28, 2006 FORM A 1. A...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online