NSCI 1322 Study Guide - Freezing-Point Depression, Boiling-Point Elevation, Colligative Properties

• School: Fordham University
• Department: Natural Science
• Course: NSCI 1322
• Professor: Marie Thomas

Document Summary

Colligative properties: properties that are dependent only on the number of solute particles in a solution does not depend on the nature of the solution. Raoult"s law:solutions that have only 1 solute o. P1: = vapor pressure of the pure solvent. Solutions with 2 solutes o o p1= p= x 2 p1. Volatile component: very low vapor pressure and therefore easily evaporates. Pt=p a+pb=x a pa o: + x b pb o. Positive deviation: when forces between components are weak, the total vapor pressure is greater than we"d expect (a-b < a-a & b-b) Negative deviation: when forces between components are strong, the total vp is less than we"d expect (a-b > a-a & b-b) Fractional distillation: one component will evaporate out (lower boiling point) and separate from the other component with high boiling point. T b=t b t b: =kb m. Tb: = boiling point of pure solution kb = solvent constant m = molality.