We’re being asked to find the freezing point of a solution when table sugar is dissolved in water. When calculating the freezing point of a solution, we’re going to use the equation for Freezing Point Depression.
∆Tf = change in freezing point = Tf pure solvent –Tf solution
Kf = freezing point depression constant
i = van' t Hoff factor of the solute = no. of ions
m = molality
We will do the following steps:
Step 1: Calculate the molality of the solution.
Step 2: Determine the other required values for the Freezing Point Depression
Step 3: Calculate the freezing point of the solution
When 13.62 g (about one tablespoon) of table sugar (sucrose, C12H22O11) is dissolved in 241.5 mL of water (density 0.997 g/mL), the final volume is 250.0 mL (about one cup).
Calculate the expected freezing point for the solution.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Freezing Point Depression concept. If you need more Freezing Point Depression practice, you can also practice Freezing Point Depression practice problems.