Pre-Lab: Colligative Properties and Ice Cream (Total 10 Points) Note: In preparing this report you are free to use references and consult with others. However, you may not copy from other students’ work (including your laboratory partner) or misrepresent your own data (see honor code). Name(Print then sign): ___________________________________________________ Lab Partner: ____________________________________________________________ Lab Day: ___________________Section: ________TA_________________________ 1. Define molality (m) and molarity (M) by writing an equation for each. 2. What is the freezing point of a solution of 13.0 g of NaCl in 225 g of water? The molal freezing point constant for water is 1.86 Ckg / mol . Remember: Equation for a molecule that dissociates: ΔT = iKfm Where ΔT = Tpure – Tsolution (Tpure of solvent) i = # ions in solution (if the solute does not dissociate i=1) Kf = Freezing point depression constant (C/m) m = concentration in molality (molesolute/kgsolvent)