Chapter 12 - 1 Introduction Terminology: Solute Solvent...

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2 Introduction http://www.webalice.it/alberto.frangini/IM000889.JPG Terminology: Solute Solvent Dilute solution and concentrated solution Solution concentration Types of solution Solubility Like dissolves like
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3 Energies involved in solution formation a. Pure solvent Separated solvent molecules ΔH a > 0 b. Pure solute Separated solute molecules ΔH b > 0 c. Separated solute and solvent molecules Solution ΔH c < 0 Pure solvent + Pure solute Solution ΔH solution = ΔH a + ΔH b + ΔH c
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4 Solution formation in equilibrium At equilibrium, rate of dissolving = rate of crystallization Saturated solution Solubility Unsaturated solution Solubility of solids in water increases with temperature. Solubility of a solute X is 20 g / 100 g of water at 45 0 C and 10 g / 100 g of water at 25 0 C. What happens when a solution of 15 g of X in 100 g of water at 45 0 C is cooled to 25 0 C.
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5 Solutions of gases in liquids Effect of temperature: For most gases, solubility in water decreases with increase in temperature. Solubility of gases in organic solvents, increases with increase in temperature.
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Chapter 12 - 1 Introduction Terminology: Solute Solvent...

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