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Math Help - Determining pH

  1. #1
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    Determining pH

    After titrating sodium hydroxide with hydrofluoric acid, a chemist determined that the reaction had formed an aqueous solution of 0.020mol/L sodium fluoride. Determine the pH of the solution.

    Thank you
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  2. #2
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    First we have to assume that all of the hydrofluoric acid is reacting (which is a reasonable assumption). From the stiochemistry of the reaction you know that one moles of hydrofluoric acid acid reacts to give a mole sodium fluoride and a mole of H+ ions.

    so the ph should just be - \log (0.02)

    but then i havent accounted for the affect of the following eqaulbirum H^{+} + OH^{-} \Leftrightarrow H_{2} O
    in which case you would need to know the water dissociation constant for the given conditions.
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