Practice MT2 Sp 08

Practice MT2 Sp 08 - NORTHEASTERN UNIVERSITY Department of...

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NORTHEASTERN UNIVERSITY Department of Chemistry General Chemistry CHM U 214 D Your Name______ KEY ________ Spring 2008 ID Number____________________ Practice Mid-Term Exam 2 e-mail________________________ DIRECTIONS This exam consists of four pages and 25 multiple answer questions. Mark the letter (a, b, c or d) of each best answer on the Scantron sheet. Write your answer on this test for your records. Keep it to prepare for the Final Exam. __a_1. The pH of absolutely pure water is a. 7.0 b. less than 7.0 c. more than 7.0 __b_2. An aqueous solution containing NaCl and HCl must be a. basic b. acidic c. neutral __c_3. A solution with pOH = 4.5 has pH equal to a. 4.5 b. 7.0 c. 9.5 d. none of these __d_4. Which 0.1 M solution is neutral? a. HBr b. CsOOCCH 3 c. KOH d. NaBr __b_5. Which of these ions is amphoteric when dissolved in water? a. Br - b. HPO 4 - c. OH - d. b and c __b_6. The triprotic acid H 3 XO 3 has K A2 = 2.0 x 10 -8 . Therefore, K B2 for HXO 3 - is a. 1.0 x 10 -14 b. 5.0 x 10 -7 c. 5.0 x 10 -8 d. 1.0 x 10 -7 __d_7. The pH of the product solution made by precisely titrating aqueous 0.05 M acetic acid (K A = 1.8 x 10 -5 ) with 0.05 M NaOH is a. 14.0 b. 7.0 c. less than 7.0 d. more than 7.0 __c_8. . Which indicator is most suitable for detecting the true endpoint in the titration in Question 7? a. bromophenol blue (yellow → bluish purple, pH 3 → 4.6) b. methyl red (red → yellow, pH 4.2 → 6.3) c. cresol red (yellow → red, pH 7.2 → 8.8) __b_9. The pH of 2.0 x 10 -2 M acetic acid solution (pK A = 4.74) is a. 3.37 b. 3.22 c. 10.63 d. 10.78 __b_10. Which of the following solutions is a buffer solution?
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Practice MT2 Sp 08 - NORTHEASTERN UNIVERSITY Department of...

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