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chem

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A hydrofluoric acid buffer solution has the following concentrations:
[HF]=0.43M
[F-]=0.45M
If 40 mL of 0.1M NaOH is added to 500 mL of the buffer, what is the resultant pH?

  • chem -

    millimols HF = mL x M = 500 mL x 0.43M = 215
    mmols F^- = 500 mL x 0.45M = 225
    40 mL x 0.1M NaOH = 4 millimols.

    ...........HF + OH^- ==> F^- H2O
    initial...215....0......225......
    add.............4.0............
    change...-4.....-4........+4.........
    equil....211......0.....229

    Substitute the equil line from the ICE chart into the HH equation and solve for pH.

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