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7 Written questions

6 Multiple choice questions

  1. KOH, HI
  2. 0.0176 M NH3
  3. Elven 1.1
  4. 21.2
  5. 9.73
  6. KNO3

6 True/False questions

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


  2. What is the molar solubility of magnesium carbonate (MgCO3) in water? The solubility-product constant for MgCO3 is 3.5 x 10^-8 at 25C.KNO3


  3. 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)


  4. 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


  5. 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


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


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