Strong Bases vs. Weak Bases Worksheet
- Answer Key

 

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  1. What is the BrФnsted-Lowry defintion of a base?

    A substance that accepts H+.

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  2. What is the generalized equation for the reaction of a base in water?

                                                    B + H2O     BH+ + -OH

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  3. What is Kb?

     Kb is the equilibrium constant for a base. 

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  4. What are some characteristics of strong bases?
    • Equilibrium lies so far to the right that reaction is said to go to completion.
      [XOH] = [– OH]
      [X(OH)2] = 2 x [– OH]

    •  Strong bases have very large Kb values.
    • Strong bases yield conjugate acids that are weaker than water.  Therefore their presence has no effect on pH.

     

     

  5. What are some characteristics of weak bases?
    •  Equilibrium lies far to the left.
    •  Weak bases have Kb << 1
    •  Weak bases yield a conjugate that is a stronger acid than water. Thus, they can affect the pH of a solution.

     

     

  6. How can you identify a strong base?

    Strong bases are substances that have a Group 1 or 2 cation ionically bound to –OH, –NH2, –CH3, etc.

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  7. How can you identify a weak base?

    Weak bases typically contain an amine derivative (NH3, CH3NH2, etc.) or it is the conjugate base of a weak acid.

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