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Exam2Key - CH201-001 SSII 2009 Exam 2(exam code A Name Last...

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CH201-001 SSII 2009 Name:____________________________________ Exam 2 (exam code A) Last First Instructions: 1) Clearly write name on each page 2) All work must be shown for full credit 3) There is a ± 1 digit tolerance for significant figures 4) Be sure answers have proper significant figures AND units N A = 6.02 x 10 23 mol -1 R = 8.314 Jmol -1 K -1 G o = H o – T S o G ° = - RT(ln K eq ) pH = pK a + log n a n b = K a x 10 pH n a n b Acid K a pK a HF 7.2x10 -4 3.14 HNO 2 4.0x10 -4 3.40 CH 3 COOH 1.8x10 -5 4.74 H 2 CO 3 4.3x10 -7 6.37 H 2 S 1.0x10 -7 7.00 NH 4 1+ 5.6x10 -10 9.25 HCO 3 1- 4.7x10 -11 10.33 HS 1- 1.3x10 -13 12.89
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CH201-001 SSII 2009 Name:____________________________________ Exam 2 (exam code A) Last First 1. At 50 o C, the pH of pure water is 6.63. What is K w at 50 o C? (6 points) 10 -pH = [H 3 O 1+ ] [H 3 O 1+ ] = [OH 1- ] Kw = [H 3 O 1+ ][OH 1- ] K w = ____5.50x10 -14 _______ 2. Determine if each of the following should be increased or decreased in order to shift the following equilibrium to form more products if H o < 0; circle your answer: (8 points) 2 NO 2 (g) N 2 O 4 (g) [NO 2 ]: increase / decrease Volume: increase / decrease [N 2 O 4 ]: increase / decrease Temperature: increase / decrease 3. A 325 mg tablet of Aspirin (HC 9 H 7 O 4 , M m
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