Colligative Properties Formulas

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7 Terms

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Molality (m)

Moles of solute/kg of solvent

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Molarity (M)

Moles of solute/L of total solution

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Mole Fraction (Xa)

Moles of A/Total # of moles

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Henry’s Law

concentration = Constant x Partial Pressure (c = KP)

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Vapor Pressure Lowering

Pressure of solution = mole fraction of solvent x vapor pressure of pure solvent (P1 = Xa * P°1)

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Boiling Point Elevation

Change in boiling point = Van’t Hoff x Boiling point constant x molality (ΔTb = i *Kb * m)

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Freezing Point Depression

Change in freezing point = Van’t Hoff x Boiling point constant x molality ( ΔT = i Kb * m)