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NEET-XII-Chemistry

02: Solutions

with Solutions - page 4
Qstn# B-33 Prvs-QstnNext-Qstn
  • #33
    19.5
    g of CH2FCOOH
    is dissolved in 500 g of water. The depression in the freezing point
    of water observed is 1.0°C. Calculate the van’t Hoff factor
    and dissociation constant of fluoroacetic acid.
    Ans : It is
    given that:

    We know
    that:

    Therefore,
    observed molar mass of
    The
    calculated molar mass of is:

    Therefore,
    van’t Hoff factor,

    Let
    α
    be the degree of dissociation of


    Now,
    the value of Ka is given as:


    Taking
    the volume of the solution as 500 mL, we have the concentration:

    Therefore,