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Assuming equal concentrations, rank these aqueous solutions by their freezing point: low to high
NH4Cl, Sn(ClO3)4, Na2SO4, and AlBr3.

  • Chemistry -

    delta T = i*Kf*m
    f.p. = 0 C - delta T.

    So m and Kf are constant; the only variable is i = van't Hoff factor.
    i = 2 for NH4Cl
    i = 5 for Sn(ClO3)4
    i = 3 for Na2SO4
    i = 4 for AlBr3.

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