05 Notes - Colligative Properties

05 Notes - Colligative Properties - Aim How are colligative...

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Aim: How are colligative properties affected by the addition of a solute? QQ: How many mL of a 6.0 M stock solution would be needed to make 400 mL of a 1.5 M solution? Do Now: Why do some people put salt in the water before they make pasta? Why do we put salt on sidewalks when they are icy? Colligative Properties: properties that depend on the number of non-volatile solute particles present and the nature of the solvent. These properties do not depend on the actual identity of the solute. What happens to entropy when a solute is added to a solvent? Entropy increases because a mixture is formed. What happens to the number of intermolecular bonds when a solute is added to a solvent? More intermolecular bonds will exist. Vapor Pressure As a solute is added, the solvent molecules are more spread out. This lowers the vapor pressure of the solution compared to the pure solvent. Boiling Point Intermolecular forces must be broken in order for a substance to boil.
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05 Notes - Colligative Properties - Aim How are colligative...

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