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molality - freezing point

Discussion in 'MCAT Study Question Q&A' started by cloosh, Jun 21, 2008.

  1. cloosh

    cloosh Junior Member 7+ Year Member

    Mar 24, 2006
    so if i have a certain solute, and i put the same amount of it into water and acetic acid, with acetic acid having a greater freezing point change, i have to look at both of the molalities to see which one dissociates more? i was confused i guess because i thought (with the same solute) i could just look at the freezing point change and use that to determine how much better it dissociates in one solvent compared to another
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  3. 161927

    161927 Guest

    Aug 5, 2007
    The equation ΔTf = Kf · mB measures the freezing point depression as a function of the molality and a constant related to the solvent. To determine which solvent dissolves the solute most, you could calculate the freezing point depression for each solution, using the appropriate molalities, and the greatest freezing point depression would result from the solvent which dissolves the solute more.

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