1 1 8 10 9 2 5 6 10 6 correct 3 1 8 10 16 4 5 6 10 8 5 1 8 10 9 Explanation 014

# 1 1 8 10 9 2 5 6 10 6 correct 3 1 8 10 16 4 5 6 10 8

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1. 1 . 8 × 10 9 2. 5 . 6 × 10 6 correct 3. 1 . 8 × 10 16 4. 5 . 6 × 10 8 5. 1 . 8 × 10 9 Explanation: 014 10.0points Which of the following aqueous solutions gives a pH greater than 7? 1. 10 8 M HCl 2. 10 8 M NH 4 Cl 3. 10 8 M CH 3 COOH byrne (cmb3744) – H07: Acid-Base 2 – mccord – (51620) 5 4. 10 8 M HCOOH 5. None of the solutions gives a pH greater than 7. correct Explanation: 015 10.0points The pH of 0.010 M aniline(aq) is 8.32. What is the percentage aniline protonated? 1. 0.69% 2. 2.1% 3. 0.021% correct 4. 0.12% 5. 0.21% Explanation: 016 10.0points Write the charge balance equation for a dilute aqueous solution of HI. 1. [H 3 O + ] = [OH ] 2. [I ] = [OH ] + [H 3 O + ] 3. [H 3 O + ] = [I ] + [OH ] correct 4. [HI] initial = [I ] 5. [H 3 O + ] = [I ] Explanation: 017 10.0points Which equation represents K a2 for sulfurous acid? 1. SO 2 3 (aq) + H 2 O( ) HSO 3 (aq) + OH (aq) 2. H 2 SO 3 (aq) + H 2 O( ) HSO 3 (aq) + H 3 O + (aq) 3. H 2 SO 3 (aq) + 2 H 2 O( ) SO 2 3 (aq) + 2 H 3 O + (aq) 4. HSO 3 (aq) + H 2 O( ) H 2 SO 3 (aq) + OH (aq) 5. HSO 3 (aq) + H 2 O( ) SO 2 3 (aq) + H 3 O + (aq) correct Explanation: 018 10.0points For a solution labeled “0.10 M H 3 PO 4 (aq),” 1. [H + ] = 0.30 M. 2. [H + ] = 0.10 M. 3. [H + ] is less than 0.10 M. correct 4. [H 2 PO 4 ] is greater than 0.10 M. 5. [PO 3 4 ] = 0.10 M. Explanation: 019 10.0points The pH of 0.010 M H 3 PO 4 (aq) is 2.24. Esti- mate the concentration of PO 3 4 in the solu- tion. For H 3 PO 4 , the values of K a1 , K a2 , and K a3 are 7 . 6 × 10 3 , 6 . 2 × 10 8 , and 2 . 1 × 10 13 , respectively. 1. 5 . 8 × 10 3 M 2. 7 . 6 × 10 3 M 3. 2 . 1 × 10 13 M 4. 6 . 2 × 10 8 M 5. 2 . 3 × 10 18 M correct Explanation: 020 10.0points Consider the fractional composition dia- gram for the amino acid alanine. byrne (cmb3744) – H07: Acid-Base 2 – mccord – (51620) 6 0.2 0.4 0.6 0.8 1.0 2 4 6 8 10 12 14 pH Fractional Composition What is the structure of the dominant species at pH 10? 1. OOC CH(CH 3 )NH + 3 2. HOOC CH(CH 3 )NH + 3 3. OOC CH(CH 3 )NH 2 correct Explanation: To the left of 2 . 348, the red graph represent- ing HOOC CH(CH 3 )NH + 3 is dominant. #### You've reached the end of your free preview.

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• Fall '10
• McCord
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