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March 26, 2017

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assuming complete dissociation of the solute, how many grams of \rm KNO_3 must be added to 275 \rm mL of water to produce a solution that freezes at -14.5 ^\circ {\rm C}? The freezing point for pure water is 0.0 ^\circ {\rm C} and K_f is equal to 1.86 ^\circ {\rm C}/m.

  • chemistry - ,

    delta T = i*Kf*m
    Solve for m.

    m = moles KNO3/kg solvent
    Solve for moles KNO3.

    moles KNO3 = grams KNO3/molar mass KNO3
    Solve for grams.
    i = 2

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