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Weak bases react with water to produce strong base?

  1. Dec 13, 2016 #1
    • Please post this type of questions in the HW section using the template and showing your work.
    Which of the following statements about weak acids and weak bases are false?
    (i) The strength of a weak acid decreases as itspKa
    decreases.
    (ii) Weak bases react with water to produce a small amount of a strong base.
    (iii) The strength of a base decreases as the strength of its conjugate acid increases.
    A)ii, iii
    B)i
    C)i, ii
    D)ii
    E)i,iii

    The correct answer is B but I don't quite understand the second statement. Is OH- alone considered as a strong base?
     
  2. jcsd
  3. Dec 14, 2016 #2

    Borek

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    Staff: Mentor

    What definitions of a base do you know?
     
  4. Dec 14, 2016 #3
    A base produces oh- in water or it's a proton acceptor or an electron donor
     
  5. Dec 14, 2016 #4

    Borek

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    Staff: Mentor

    So is OH- a base?

    And if so, in the presence of excess water, can there exist a stronger one?
     
  6. Dec 14, 2016 #5
    If oh- is a base then in the presence of water, there cannot be a stronger base than oh-... right???
     
  7. Dec 15, 2016 #6

    Borek

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    Staff: Mentor

    Exactly. It is called a leveling effect (and is not limited to water, it is a general property of solvents - just replace OH- with the basic form of the solvent).
     
  8. Dec 15, 2016 #7
    Thank you for your response
     
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