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Identify the acid, its conjugate base, the base and its conjugate acid in the following reaction:(2 marks)

H3PO4(aq) + NH3(aq)H2PO4-(aq) + NH4+(aq)

  1. Because rain washes pollutants out of the air, many Ontario lakes are undergoing changes in pH. The water in one such lake was found to have a hydronium ion concentration of 3.2 x 10-5M. What is the pH of this lake? Is it considered acidic or basic? (2 marks)
  2. The pH of a sample of human blood was measured to be 7.41 at 25oC. What is the hydroxide ion [OH-(aq)] concentration? (3 marks)
  3. What is the pH of a sodium hydroxide solution at 25oC in which the hydroxide ion concentration is 0.0026 mol/L? Is the solution acidic or basic?(3 marks)
  4. A 0.20 M solution of hydrofluoric acid (HF(aq)) has a pH of 3.96 at 25oC. Calculate theKaand Percent Ionization of hydrofluoric acid.(4 marks)

HF(aq) + H2O(l)F-(aq) + H3O+(aq)

  1. A 25.00 mL sample of 0.379 M nitric acid (HNO3(aq)) is titrated with 12.00 mL of 0.573 M lithium hydroxide (LiOH(aq)). Determine the amount of [H+(aq)] remaining in the flask and pH of the solution after reaction.(4 marks)

 

 

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