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.