Ch_12-2_Solubility (2)

Ch_12-2_Solubility (2) - SUPERSATERATED SOLUTION OF SODIUM...

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Ethylene glycol (CH 2 OHCH 2 OH) +H 2 O Oil + H 2 O Miscible Immiscible LIKE DISSOLVES LIKE E10
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Sucrose: C 12 H 22 O 11 LIKE DISSOLVES LIKE More soluble benzene (C 6 H 6 ) or water?
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LIKE DISSOLVES LIKE Sucrose
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LIKE DISSOLVES LIKE Very polar Largely nonpolar Soluble in H 2 O Soluble in fat Extensive H-bonding Little H-bonding
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SOLUBILITY OF DIFFERENT GASES IN WATER N 2 O 2 NH 3 He HCl CO 2 HF HBr HI Low (4.22 x10 -4 m at 0 ºC and 1 atm) Low (1.03 x10 -3 m at 0 ºC and 1 atm) Low (2.21 x10 -3 m at 0 ºC and 1 atm) Moderate (7.60 x10 -2 m at 0 ºC and 1 atm) High (Ammonia fountain) High H-bonding High Dissociates into ions stabilized by polar water molecules Reacts with water H 2 CO 3 (aq) (Strong electrolyte)
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HYDRATION OF IONS
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SOLUTIONS Unsaturated Saturated Supersaturated
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SUPERSATERATED SOLUTION OF SODIUM ACETATE More soluble in hot water Carefully prepare saturated solution in hot water (clean) Carefully cool saturated solution
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Unformatted text preview: SUPERSATERATED SOLUTION OF SODIUM ACETATE THE ENTHALPY OF DISSOLUTION THE ENTHALPY OF DISSOLUTION Exothermic Endothermic TWO PARTS TO SPONTANEITY 1. System seeks minimum of energy 2. System seeks maximum entropy (Mixing of gases) (Details reserved for chem 126) THE TEMPERATURE DEPENDENCE OF SOLUBILITY Calcium acetate, Ca(CH 3 COO) 2 Hot Cool THE EFFECT OF PRESSURE ON SOLUBILITY Henrys Law: C = k P k = 3.91 x 10-2 m/atm at 20 C for CO 2 (g) Concentration of carbon dioxide in water at 1 atm: C = k P = (3.91 x 10-2 m/atm)(1atm) = 0.0391 m Concentration of carbon dioxide in water at 5 atm: C = k P = (3.91 x 10-2 m/atm)(5atm) = 0.196 m THE EFFECT OF TEMPERATURE ON SOLUBILITY What is implied about H of dissolution? or negative Exothermic...
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Ch_12-2_Solubility (2) - SUPERSATERATED SOLUTION OF SODIUM...

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