Molality and Colligative Properties

The video explains colligative properties, which are characteristics of solutions that depend on solute concentration rather than chemical identity. It covers vapor pressure lowering, boiling point elevation, and freezing point depression, emphasizing the role of solute particles in these phenomena. The video also distinguishes between molality and molarity, highlighting the importance of molality in discussing colligative properties. Practical applications, such as using salt to lower the freezing point of water on icy streets, are also discussed.

What is the primary factor that colligative properties depend on?

• The chemical identity of the solute

• The concentration of the solute

• The temperature of the solution

• The volume of the solvent

Which unit is preferred when discussing colligative properties?

• Mole fraction

• Normality

• Molality

• Molarity

How does the presence of solute particles affect the boiling point of a solution?

• It makes the boiling point unpredictable

• It has no effect on the boiling point

• It raises the boiling point

• It lowers the boiling point

What happens to the freezing point of a solution when solute is added?

• It increases

• It decreases

• It becomes zero

• It remains the same

Why is salt added to icy streets during winter?

• To increase the freezing point of water

• To decrease the freezing point of water

• To make the ice melt faster

• To prevent water from evaporating