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March 30, 2017

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If given the Ka or Kb and pKa and pKb, how do you find the initial concentration of a weak acid/base in a solution given the pH? Is there an equation for this? I can't find anything in my notes and am not sure what to look for.

  • P. Chemistry - ,

    HA ==> H^+ + A^-

    Ka = (H^+)(A^-)/(HA)

    Given the pH, convert to (H^+). That is the same as (A^-). You are given either Ka or pKa. That leaves only one unknown, (HA).

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