P_Ex2keyS08 - Practice Exam 2 for VandenBout and Laude...

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Practice Exam 2 for VandenBout and Laude Spring 2008 1. What is the concentration of hydroxide ions in a solution that contains of 0.100 M HCN(aq) and 0.200 M NaCN(aq)? A. 2.4 × 10 5 M B. 1.1 × 10 9 M C. 2.5 × 10 10 M D. 4.1 × 10 5 M Answer: D 2. 10 ml of 0.1 M LiOH is added to each of the following solutions. Which of them will still be a buffer after addition of the base? I) 20 ml of 0.1 M HClO4 II) 20 ml of 0.1 M HClO2 III) 10 ml of 0.1 M HClO2 IV) 10 ml of 0.2 M HClO2 and 10 ml of 0.1 M HClO2 V) 10 ml of 0.1 M HClO2 A. II only B. I and II C. all of them D. II and IV E. IV and V Answer: D 3. Which of the following species is the strongest base in water? A. the conjugate base of HNO 3 B. the conjugate base of a weak acid with pK a = 2.5 C. a compound with a pK b = 7.5 D. a compound with a pK b = 4.5 E. the conjugate base of a weak acid with pK a = 11.5 Answer: E 4. A solution of 0.5 M barium hydroxide dissociates completely in 100 ml of a 0.5 M formic acid and 0.4 M lithium formate. What is the volume of barium hydroxide that can be added before the buffer capacity is exceeded? A. 20 ml B. 40 ml C. 100 ml D. 50 ml
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E. 90 ml Answer: D 5. A buffer solution of volume 200.0 mL is 0.250 M Na 2 HPO 4 (aq) and 0.250 M KH 2 PO 4 (aq). The pH resulting from the addition of 50.0 mL of 0.100 M NaOH(aq) to the buffer solution will be A. 7.12 B. 7.21 C. 7.30 D. 12.77 Answer: C 6. The titration curve for the titration of 0.100 M H 2 SO 3 (aq) with 0.100 M KOH(aq) is given below. Estimate p K a1 and p K a2 of H 2 SO 3 . Answer: pKa1 ~ 2.0 and pKa2 ~ 6.9 7. What is the pH at the stoichiometric point for the titration of 0.100 M CH 3 COOH(aq) with 0.100 M KOH(aq)? The value of K a for acetic acid is 1.8 × 10 –5 . A.
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This note was uploaded on 04/12/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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P_Ex2keyS08 - Practice Exam 2 for VandenBout and Laude...

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