NAME: ________________________

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7 Written Questions

6 Multiple Choice Questions

  1. 0.0176 M NH3
  2. Elven 1.1
  3. 7.54 (blue dog)
  4. 0.0856
  5. 1.9 x 10^-4
  6. 1.966

6 True/False Questions

  1. Of the following solutions which has the greatest buffering capacity?0.821 M HF and 0.909 M NaF


  2. Calculate the pH of a solution prepared by dissolving 0.750 mol of NH3 and 0.250 mol of NH4Cl in water sufficient to yield 1.00 L of solution. The Kb of ammonia is 1.77 x 10^-5.9.73


  3. A solution is prepared by dissolving 0.23 mol of hydrazoic acid and 0.27 mol of sodium azide in water sufficient to yield 1.00 L of solution.The addition of 0.05 mol of NaOH to this buffer solution causes the pH to increase slightly. The pH does not increase drastically because the NaOH reacts with the __________ present in the buffer solution. The Ka of hydrazoic acid is 1.9 × 10-5.9.73


  4. Which one of the following pairs cannot be mixed together to form a buffer solution?RbOH, HBr


  5. The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 ml of 0.125 M HCl is ________.1.966


  6. What is the pH of a buffer solution that is 0.211 M in lactic acid and 0.111 M in sodium lactate? The Ka of lactic acid is 1.4 x 10^-4.7.54 (blue dog)


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