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Homework Help: Ion concentration OF NaCl

  1. Jan 8, 2013 #1
    1. The problem statement, all variables and given/known data

    For instance I have NaCl. I found a relationship between conductivity of NaCl in water and concentration of NaCl in the water. It's; conductivity is approx 0.5 concentration

    Is it correct that the change in concentration gives the number of ions?

    For example say I start off with conductivity of 100 microsiemens/cm and a concentration of 50 mg/L for the NaCl. At the end let's say I have 50 microsiemens/cm and a concentration of 25 mg/L.

    25 mg/L = 0.025 g/L = 4.3 x 10^-4 Mol/L = 4.3 x 10^-4 M using the molar mass of NaCl of 58.44 g/Mol

    Is the change in ion concentration 25 mg/L = 4.3 x 10^-4 M?

    Or can you get an "actual" number change for example a change of 1000 ions lets say. Or is change in ion concentration always generally put in terms of M?

  2. jcsd
  3. Jan 8, 2013 #2


    User Avatar

    Staff: Mentor

    Have you ever heard about units?

    No idea what you are talking about, but no.

    Sorry, what you wrote makes completely no sense to me.
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