Chemistry

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A solution of the primary standard potassium hydrogen phthalate, KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 24.71 mL to reach a phenolphthalein end point. What is the molarity of the KOH solution?

  • Chemistry -

    The titration is a 1:1 titration of KHP and KOH.
    KOH + KHP ==> H2O + K2P

    mols KHP = grams/molar mass
    mols KOH = mols KHP (look at the coefficients in the balanced equation; they are 1:1)
    M KOH = mols KOH/L KOH

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