y3plg 2018 TC295.CHM.112.LO8C.SP18 Week of Feb 19 > > Lab 5: Colligative Propert

Question

y3plg 2018 TC295.CHM.112.LO8C.SP18 Week of Feb 19 > > Lab 5: Colligative Properties Pre olligative Properties Prelab Quiz How will you know you have reached the freezing/melting point? The thermometer will indicate the solution is below 0. OWe are not finding the melting point of a solution in this lab. The new freezing point will be calculated using the data in Table 1. The temperature will remain constant for 3-4 readings. The solution will be frozen. Points possible: 1 Unlimited attempts Submit 18

Explanation / Answer

How will you know you have reached the freezing /melting point?

Ans: The temperature will remain constant for 3-4 readings

Which solute would have the greatest impact on freezing point depression?

Ans: CaCl2, because it has van't Hoff factor of 3

Freezing point depression, TF(Solvent) - TF(Solution) = KF x b x i

Here i is the van't Hoff factor. i = 3 for CaCl2 because it disssociates in to Ca+2 and 2 Cl- ions (total 3 number of ions).

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