REVIEW QUESTIONS

Test 2

  1. Calculate the pH of a 1.8 M solution of methyl amine .
  2. Calculate the pH of a solution prepared by adding 40.0 mL of to 20.0 mL of water. ( of )
  3. Calculate the pH of a solution resulted from mixing of HCl solution ( ) with of HCl solution .
  4. How many grams of ammonia are needed to make 1.25 L solution with a pH of 11.68 ?
    of
  5. The solubility of in pure water is . Assuming that dissolved is in the form of , what is the pH of a 0.0037 M solution of dissolved ?
    for
  6. Calculate the pH of a solution of .
  7. Phenol has a value of . What is the value for phenoxide ion ?
  8. A benzoic acid solution has a pH of 2.80. Given that of benzoic acid is , calculate the concentration and percent dissociation of this acid.
  9. Determine the pH of a 0.10 M NaCN solution.
  10. Write net ionic equations for the reactions that take place when aqueous solutions of the following substances are mixed:
    a) sodium cyanide and nitric acid
    b) potassium hydrogen sulfate and lithium acetate
  11. Based on molecular structure, choose the stronger acid in each pair. Explain your reasoning.
    a) or
    b) or HClO
    c) or
    d) or
  12. For each pair given below, determine which is more basic. (Assume the same concentration for all solutions).
    a) Solution of NaClO and solution of HF
    b) Solution of KCl and solution of
    c) Solution of and solution of HCN
  13. Calculate the pH and in a solution that is and 0.050 M HCN . ( acetic acid and )
    Note: Concentration of acids given are after mixing.
  14. Complete the reaction shown below and determine whether the forward reaction or the reverse reaction is favored.
  1. What is the change in pH if [ ] changes by each of the following factors?
    a) 1000
    b)
    c) 2.0

ANSWERS

  1. 12.45
  2. 11.04
  3. 2.40
  4. 27.2 g
  5. 4.40
  6. 9.18
  9. 11.15
  10. No answers provided
  11. a) (Se larger than S causing acid bond to be weaker)
    b) (The greater number of oxygens cause more polar acidic bond)
    c) (Sulfur is more electronegative than Se causing the acid bond to be more polar)
    d) (the 3 electronegative chlorine atoms withdraw electrons from the oxygen, in turn causing the acidic bond to become more polar)
  12. No answers given
  14. No answers provided
  15. a) 3
    b) 5
    c) 0.3