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March 25, 2017

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Calcium chloride has been used to melt ice from roadways. Given that the saturated solution is 32% calcium chloride by mass, estimate the freezing point. Express your answer in degrees Celsius. Assume that calcium chloride behaves ideally in solution.

  • Chemistry - ,

    32% CaCl2 means 32 g CaCl2/100 g soln or
    32 g CaCl2 in 68 g water. The moles CaCl2 then is 32g/molar mass CaCl2
    molality = moles CaCl2/0.068 kg.

    delta T = i*Kf*m
    i = 3. solve for delta T and convert to freezing point.

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