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AP chemistry

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A solution of sodium hydroxide is standard-
ized against potassium hydrogen phthalate
(KHP, formula weight 204.2 g/mol). From
the following data, calculate the molarity of
the NaOH solution: mass of KHP 1.894 g;
buret reading before titration 0.13 mL; buret
reading after titration 32.57 mL.
Answer in units of M.

  • AP chemistry -

    moles KHP = grams/molar mass
    Substitute and solve for mols.

    KHP + NaOH ==> NaHP + H2O
    so the reaction is 1:1 and moles KHP = moles NaOH.
    Then M NaOH = moles NaOH/L NaOH.
    To obtain L NaOH, you will need to subtract the final buret reading - initial buret reading and convert to L.

  • AP chemistry -

    Do I use the molar mass of just KHP or with H2O as well?

  • AP chemistry -

    mols of solute therefore just KHP

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