1aa3-2012-tut2-q

1aa3-2012-tut2-q - CHEMISTRY 1AA3 Week of JANUARY 16, 2012...

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CHEMISTRY 1AA3 Week of JANUARY 16, 2012 TUTORIAL PROBLEM SET 2 – QUESTIONS ______________________________________________________________________________ Page 1 of 2 1. Which of the following combination of reagent will result in a buffer? a. 100 mL 0.1M NaOH plus 50 mL 0.1M CH 3 COOH b. 100 mL 0.1M NaOH plus 100 mL 0.1M CH 3 COOH c. 100 mL 0.1M KOH plus 100 mL 0.2M CH 3 COOH d. 100 mL 0.1M NH 3 plus 50 mL 0.2M HCl(aq) e. 100 mL 0.1M NH 3 plus 50 mL 0.1M HBr(aq) 2. Describe the pH of a buffer solution consisting of 100 mL containing 0.1M CH 3 COOH and 0.125M CH3COO- , both before and after addition of 10 mL of 0.25M HCl. K a = 1.8 x 10 -5 . 3. Which of the three acids given below would be appropriate to prepare a buffer solution to maintain the pH at 4.30? What ratio of the acid/conjugate base should be used to fix the pH at 4.30? Acid Conjugate Base K a HSO 4 - SO 4 2 1.2 10 2 CH 3 COOH CH 3 COO 1.8 10 5 HCN CN 4.0 10 10 4. Calculate the pH of the equivalence point when 25 mL of 0.10 M NH
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This document was uploaded on 03/29/2012.

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1aa3-2012-tut2-q - CHEMISTRY 1AA3 Week of JANUARY 16, 2012...

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