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Homework Help: Electrochemistry Problem

  1. Apr 12, 2014 #1


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    Gold Member

    1. The problem statement, all variables and given/known data
    A sample of water from a large swimming pool has a resistance of 10000Ω at 25C when placed in a certain conductance cell. When filled with 0.02M KCl solution, the cell has a resistance of 100Ω at 25C. 585gm of NaCl were dissolved in the pool, which was thoroughly stirred. A sample of this solution gave a resistance of 8000Ω. Molar conductance of NaCl at that concentration is 125 and molar conductivity of KCl at 0.02M is 200Ω. Find volume of water in litres.

    3. The attempt at a solution

    I found the cell constant to be 0.4.
    [itex]k(NaCl) = \frac{0.4}{8000}[/itex]

    125 = 1000*k(nacl)/M

    Plugging all the values in the above equation gives me the wrong answer.
  2. jcsd
  3. Apr 13, 2014 #2


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    Staff: Mentor

    It is as ambiguous here, as it was at CF.
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