Asked by Kallie

We can calculate the amount of freezing point depression that will occur using the following equation:

ΔT = ikfm

where ΔT is the amount of the change in the freezing point, i is the number of particles dissolved, kf is a constant (different for each solvent), and m is the concentration of dissolved material. This concentration has units of mol per kg solvent.

With this in mind, lets calculate the amount of depression that will occur when 5 g of sodium chloride is dissolved into 0.250 kg of water. Remember when sodium chloride dissolves in water it breaks into two particles. The kf for water is 1.86 0C/m.



Report you answer with two decimal points and no units.

Answers

Answered by DrBob222
ΔT = i*Kf*m
ΔT = ?
i for NaCl is 2.
Kf = 1.86
m = moles/kg = (5 g/58.5)/0.250
Plug and chug.
Answered by Kallie
Question, How did you get 2. for I? Was the number based on the melting or boiling points of the salt or something else completely?
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