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5 October, 06:45

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?

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  1. 5 October, 07:14
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    PH = pKa + log{[A-]/[HA]}

    4.00 = 3.83 + log{[A-]/[HA]}

    [A-]/[HA] = 10^ (4.00 - 3.83) = 10^ (0.17) = 1.48

    At this pH, the number of moles of base and acid will be:

    A - = x

    HA = 0.3 - x

    Substituting these values into the equation above gives:

    x / (0.3 - x) = 1.48

    Multiplying both sides by (0.3 - x) and bringing like-terms to the same side yields:

    2.48x = 0.44

    x = 0.18

    This means that we require 0.18 moles of NaOH or

    (0.18 moles) x [ (1000 mL) / (2 moles NaOH) ] = 90 mL NaOH
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