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Molarity question

  1. Oct 30, 2004 #1
    An amount of potassium acid phthalate (KHP) weighs 0.426 g. The KHP is dissolved in a small amount of water and titrated with 16.98 mL of NaOH. Calculate the molarity, M, of the NaOH.

    The following is my answer, but it was wrong. Can anyone help? Thanks

    Molecular weight of KHP = 71.08
    0.426/71.08/0.01698 = 0.353
  2. jcsd
  3. Oct 30, 2004 #2
    The molecular weight of KHP is 204.22 g/mol. Assuming 16.98 mL was the amount needed to reach the end point your calculation is correct except for the molar mass of KHP.
  4. Oct 30, 2004 #3
    Thanks alot

    :smile: :smile: :smile:
  5. Oct 30, 2004 #4
    no problem
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