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7 Written questions

6 Multiple choice questions

  1. 1.9 x 10^-4
  2. RbOH, HBr
  3. 1.966
  4. 21.2
  5. 0.821 M HC2H3O2 and 0.713 M NaC2H3O2
  6. Elven 1.1

6 True/False questions

  1. 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


  2. The Henderson-Hasselbalch equation is __________.pH= pKa + log [base]/[acid]


  3. Of the following solutions which has the greatest buffering capacity?0.0176 M NH3


  4. 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


  5. The molar solubility of _________ is not affected by the pH of the solution/KNO3


  6. What is the pH of a buffer solution that is 0.255 M in hypochlorous acid (HClO) and 0.3333 M in sodium hypochlorite? The Ka of hypochlorous acid is 3.8 x 10^-8.3.57 cat. blue grape


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