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Tasha
Lv 7
Tasha asked in Science & MathematicsChemistry · 1 decade ago

Calculate the freezing point?

Calculate the freezing point of the following solution, assuming complete dissociation.

6.4% NaNO3 by mass in water

1 Answer

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  • bernie_bph
    Lv 5
    1 decade ago
    Favorite Answer

    Basis: 1 kg of solution

    wt NaNO3 = 6.4grams

    wt of water = 993.6 grms

    MW of NaNO3 = 85 grams/mole

    molality = (6.4/85)/0.993.6 = 0.0758 molal

    Kf = -1.86 deg C

    freezing point depression or delta T= (-1.86)(0.0758) = - 0.141 deg C

    freezing point = - 0. 141 deg C

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