Chemistry Unit 3 - Heterogeneous

Chemistry Unit 3 - Heterogeneous - 1 Homogeneous Systems...

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Unformatted text preview: 1 Homogeneous Systems have only ONE phase Mass is not exchanged with solid or gas phases Heterogeneous Systems more than one phase Gas-liquid equilibrium volatilization and dissolution Solid-liquid equilibrium dissolution, precipitation, and adsorption Chemistry Unit 3: Heterogeneous Equilibria Same Solution Techniques! Equilibria, charge balance, mass balance (if needed) n unknowns, n equations Reading: pp. 44-51 (ignore ionic strength discussion), 54-56, 69-75 2 Solid-Liquid Equilibria: Solubility Product A a B b (s) aA b+ + bB a- K = (s)] B [A ] [B ] [A b a b- a a b + By convention: [A a B b (s)] = 1 Solubility Product = K s = [A b+ ] a [B a- ] b Some engineering applications: 1. Hardness removal 2. Heavy metal removal 3. Phosphate (P) removal 4. SO x control (make CaSO 4 (s)) A major environmental significance is in the buffering of natural waters with carbonate minerals (i.e., CaCO 3 ) 3 Practice with Solubility Product Calculations 1. A sample of well water take from a limestone aquifer contains 100 mg/L of Ca 2+ and 10 mg/L of CO 3 2- . Is CaCO 3 (s) precipitating, dissolving, or in equilibrium with this groundwater? The pK s for CaCO 3 (s) = 8.34 1. Phosphorus (phosphate) is sometimes removed from wastewaters by precipitation...
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Chemistry Unit 3 - Heterogeneous - 1 Homogeneous Systems...

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