Acid-Base (v.2 KEY)

Acid-Base (v.2 KEY) - First Exam Chem 241 September 20,...

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1 First Exam September 20, 2010 Name: ________KEY-2 ______________ Chem 241 Professor Jorgenson (please print full name) Honor Code Pledge: _____________________________ ( s i g n a t u r e ) [H + ] = F + F 2 + 4K w 2 [OH F 2 w 2 + –K a + K a 2 a F 2 b K b 2 b F 2 pH = pK a + Log 10 [base] [acid ] pH = pK a1 +pK a2 2 [H + ] = K a1 K a2 [H + ] = K a1 K a2 F+ K a1 K w K a1 +F K w = 1.01 x 10 –14 HA = H + H + + K a A K a H + a H 2 A = H +2 H H + K K = K H + H H + K K A 2— = K K H H + K K COMPOUND K a1 K a2 K a3 --------------------------------------------------------------------------------------------------------------------- Acetic Acid (HCOOH) 1.75 x 10 –5 ----- ----- Adipic Acid (C 6 H 10 O 4 ) 3.80 x 10 –5 3.80 x 10 –6 ----- Ammonia (NH 4 + ) 5.70 x 10 –10 ----- ----- Benzoic Acid (C 6 H 5 COOH) 6.28 x 10 –5 ----- ----- Carbonic Acid (H 2 CO 3 ) 4.45 x 10 –7 4.69 x 10 –11 ----- Formic Acid (HCOOH) 1.80 x 10 –4 ----- ----- Pyridine (C 5 H 5 NH + ) 6.3 x 10 -6 ----- ----- Phosphoric Acid (H 3 PO 4 ) 7.11 x 10 –3 6.32 x 10 –8 7.1 x 10 –13 Sulfuric Acid (H 2 SO 4 ) ----- 1.03 x 10 –2 -----
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2 Name: __________________________________ (please print full name ) Using BLOCK CAPITAL LETTERS write the letter of your answer to each problem in the space provided below 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. _____ 11. _____ 12. _____ 13. _____ 14. _____ 15. _____ 16. _____ 17. _____ 18. _____ 19. _____ 20. _____ 1. Calculate the pH of a 0.80 F solution of ammonia. A) 11.36 B) 11.90 C) 8.73 D) 11.57 E) 2.53 F) 4.77 G) 5.27 H) 12.23 2. Near what pH value or values will carbonic acid make a good buffer? A) 6.3 & 10.3 B) 10.3 C) 8.3 and 10.3 D) 6.3, 8.3 and 10.3 E) 7.2 F) 6.3 G) 8.3 H) 6.3 and 8.3
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3 3. Calculate the fraction of dissociation of a 0.20 F benzoic acid solution. A) 5.9 x 10 -3 B) 1.1 x 10 -2 C) 1.8 x 10 -2 D) 3.0 x 10 -2 E) 9.2 x 10 -1 F) 9.7 x 10 -1 G) 9.9 x 10 -1 H) 9.8 x 10 -1 4. Calculate the equilibrium constant for the following reaction of carbonic acid: HCO 3 _ + OH _ CO 3 2 _ + H 2 O A) 6.28 x 10
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Acid-Base (v.2 KEY) - First Exam Chem 241 September 20,...

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