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Solubility - Henry’s Law Section 15.1

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Presentation on theme: "Solubility - Henry’s Law Section 15.1"— Presentation transcript:

1 Solubility - Henry’s Law Section 15.1
Solutions Solubility - Henry’s Law Section 15.1

2 Solvation Review Explain the difference between a homogeneous and a heterogeneous mixture. Give an example of a solute and an example of a solvent. What states of matter can solutions consist of? Explain the difference between soluble and insoluble. Give an example of a substance soluble in water and a substance insoluble in water.

3 Solvation Review Explain the terms miscible and immiscible and give an example of each. What is the difference between a soluble substance and a miscible substance? Describe the Tyndall Effect and the type of mixture it affects. What are the three factors that affect the rate of solvation?

4 Temperature and Solubility
As temperature is increased the solubility of a solid solute will generally increase, with a few exceptions: As the temperature is increased, the solubility of a gas will decrease. At higher temperatures the gas molecules move much faster than they do a lower temperatures. So as a general rule gases are less soluble in hot liquids than in cool liquids. That is why in the summer time there are a lot of fish kills in some estuaries due to the water being warmer and less oxygen available for the fish.

5 Pressure and Solubility – Henry’s Law
Henry’s Law – The solubility of any gas increases as the external pressure is increased This equation describe Henry’s Law: S1 = S2 ‘s’ = solubility P1 P2 ‘p’ = pressure

6 Pressure and Solubility – Henry’s Law
Example: carbonated beverages – once you “pop the top” on a Coke, the external pressure has been reduced, and the solubility of the CO2 goes down. This is why Coke goes “flat” in a very short amount of time.

7 Henry’s Law Practice Problems I
S1/P1 = S2/P2 If 0.55 g of a gas dissolves in 1.0 L of water at 2 atm of pressure, how much will dissolve at 4.5 atm of pressure? 2. A gas has a solubility of 0.66 g/L at 10 atm of pressure. What is the pressure on a 1.0 L sample that contains 1.5 g of gas?

8 Henry’s Law Practice Problems I
S1/P1 = S2/P2 If .68 g of a gas at 5 atm of pressure dissolves in 1.0 L of water at 25oC, how much will dissolve in 1.0 L of water at 8 atm of pressure and the same temperature? 4. A gas has a solubility of 1.46 g/L at 8 atm of pressure. What is the pressure of a 1.0 L sample that contains 2.7 g/L? 5. If 1.2 g of a gas at 6 atm of pressure dissolves in 1.0 L of water at 25oC, how much will dissolve in 1.0 L of water at 3 atm of pressure and the same temperature?


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