solutions_S2008 - Solutes & Solutions Solubility of...

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CHE 132 SUNY Stony Brook 1 Solutes & Solutions Solutes & Solutions • Solubility of Gasses • Colligative Properties CHE 132 SUNY Stony Brook 2 Factors Affecting Solubility Factors Affecting Solubility Pressure Effects Pressure Effects Henry’s Law: C g is the solubility of gas, P g the partial pressure, k = Henry’s law constant. Eg. Carbonated beverages are bottled under > 1 atm. gg Ck P = Higher pressures lead to Higher pressures lead to greater solubility P g C g
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CHE 132 SUNY Stony Brook 3 Factors Affecting Solubility Factors Affecting Solubility Temperature Effects Temperature Effects Majority of Gases are less soluble at higher temperatures. Situation can reverse in organic solvents Thermal pollution: if lakes get too warm, CO 2 and O 2 become less soluble and are not available for plants or animals. CHE 132 SUNY Stony Brook 4 Factors Affecting Solubility Factors Affecting Solubility Temperature Effects Temperature Effects As temperature increases, solubility of solids generally increases. Sometimes, solubility decreases as temperature increases (e.g. Ce 2 (SO 4 ) 3 ).
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CHE 132 SUNY Stony Brook 5 Example 27 g of acetylene, C 2 H 2 , dissolves in 1L of acetone at 1atm. If the partial pressure of acetylene is increased to 12 atm, what is its solubility in acetone? 11 22 Ck P P = = 27g/L 1 atm ? 12 atm 2 1 2 2 21 1 = 12 27 3.2 10 1 PP P ga t m g CC PL a t m L = == × = × CHE 132 SUNY Stony Brook 6 Colligative Properties Colligative Properties Colligative properties depend on the quantity of Colligative properties depend on the quantity of solute molecules. (E.g. freezing point depression solute molecules. (E.g. freezing point depression and melting point elevation.) and melting point elevation.) Lowering the Vapor Pressure Lowering the Vapor Pressure Melting Point Elevation Melting Point Elevation Freezing Point Depression Freezing Point Depression
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CHE 132 SUNY Stony Brook 7 Colligative Properties Colligative Properties Lowering the Vapor Pressure
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solutions_S2008 - Solutes & Solutions Solubility of...

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