Chemistry

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What is the pH of a buffer solution that is made by adding 21.0 grams of sodium fluoride to 1.00 Liter of 0.15M hydrofluoric acid? (see the Table above for the Ka of hydrofluoric acid; calculate the pH to 2 decimal places) hint: you will have to find the molarity of NaF in this solution.

Acid Dissociation Constant:
HF 6.6 x 10-4

  • Chemistry -

    Use the Henderson-Hasselbalch equation.

  • Chemistry -

    How? Im seeing the equation but what and where do i plug in?

  • Chemistry -

    pH = pKa + log (base)/(acid)
    pH = ?
    pKa you have (or can calculate it from Ka).
    base = NaF and molarity NaF = mols/L. You have grams, convert to mols.
    acid you have in M now.
    Plug and chug.

  • Chemistry -

    thanks

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