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Chemistry 12 - weak acid/electrical conductivity (2 questions)

  1. Apr 20, 2009 #1
    1. The problem statement, all variables and given/known data
    " Which of the following best describes a weak acid?"
    A. Its 0.10 M solution will have a pH = 1.00
    B. It may be very soluble, but only partly ionized.
    C. It must be very soluble and completely ionized
    D. It must be of low solubility and completely ionized


    2. Relevant equations



    3. The attempt at a solution



    1. The problem statement, all variables and given/known data
    "Which of the following solutions would typically show the greatest electrical conductivity?

    A. 1.0 M weak acid
    B. 0.8 M weak base
    C. 0.5 M strong acid
    D. 0.1 M strong base

    2. Relevant equations



    3. The attempt at a solution
    I know that the strong acid will conduct electricity better than the weak acid if the concentrations are the same, but because they're not does that mean that more of a weak acid will equal a smaller amount of strong acid? Also, would you ignore both the strong and weak bases?
     
  2. jcsd
  3. Apr 21, 2009 #2
    For your first question, a weak acid does not ionise much, usually less that 5%.
    So i would be going with question B., as for A, it seems a weird this to put in a multi choice question.

    an acid or base that strongly conducts electricity is a "strong acid or base", and no dont ignore the bases, as for concentrations, think pretty hard about how concentration effects behaviours of acids and bases
     
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