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# Unit 6: Solutions and Solubility - PowerPoint PPT Presentation

Unit 6: Solutions and Solubility. Day 3 Factors Effecting Solubility and Colligative Properties. Unit 6: Solutions and Solubility.

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### Unit 6: Solutions and Solubility

Day 3

Factors Effecting Solubility and Colligative Properties

The new salt water fish tank in room 406 must be closely monitored and have salinity and pH levels that fall within very strict guidelines. As of yesterday afternoon, the NO2- concentration was 0.25 ppm, or 0.005 M.

• What is the molality of nitrite ion in the tank?

• What is the mole fraction and weight % of nitrite?

What is the concentration of O2 in a fresh water stream in equilibrium with air at 25oC and 1.0 bar? (kH for O2 at 25oC is 1.3x10-3mol/kg bar) (Assume air to be 21% O2)

• Gas solubility (in liquids)

• Pressure and Henry’s Law

• Temperature

• Solid solubility (in liquids)

• Pressure has no effect on the solubility of solids

• Temperature

• Introduction to Colligative Properties

• Properties of a solution determined by the amount of solute in them.

• Decrease in Vapor Pressure

-Pressure of the vapor when the liquid and vapor are in equilibrium

Water surface

• Introduction to Colligative Properties

• Properties of a solution determined by the amount of solute in them.

• Decrease in Vapor Pressure

-Pressure of the vapor when the liquid and vapor are in equilibrium

Water surface

Dissolve some stuff in it….

• Introduction to Colligative Properties

• Properties of a solution determined by the amount of solute in them.

2. Boiling Point Elevation

The temperature at which the vapor pressure equals atmospheric P

Water surface

Dissolve some stuff in it….

• Introduction to Colligative Properties

• Properties of a solution determined by the amount of solute in them.

3. Freezing Point Depression

When water freezes, the molecules align in a uniform crystalline structure

Water surface

Dissolve some stuff in it….