CHEM 201 Lecture Notes - Lecture 23: Freezing-Point Depression, Colligative Properties, Molality
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Colligative properties are solution properties which depend on the collective concentration of all solutes: colligative properties are about the solvent, not the solute. Elevation of boiling point: for a solution, there is less evp to start with, so a higher temperature is needed for boiling the solvent in the solution. Tf=fp of pure solvent -fp of actual solution. *used to calculate how much the freezing point went down. Kf=freezing point depression constant with units of c/m or k/m m=molality concentration of the solute. *used to calculate how much the freezing point went down: tf can be used to calculate the molar mass of an unknown. Steps: use the previous 2 equations to find molality, times molality by the mass (in kg) of the molecule that you dissolve the molecule into, divide the gram of solute by this number. =m*r*t: molar mass can be calculated from osmotic pressure:
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