ch23---phase-equilibrium-III.ppt
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1、5/21/20245/21/2024H+H+H+OH-OH-OH-New Way Chemistry for Hong Kong A-Level Book 21Chapter 23Phase Equilibrium III:Three-Component Systems23.1 Partition of a Solute Between Two Immiscible Solvents23.2 Solvent Extraction22.3 Paper Chromatograghy5/21/20245/21/2024H+H+H+OH-OH-OH-New Way Chemistry for Hong
2、 Kong A-Level Book 22Solute=iodineSolvent 1=waterSolvent 2=1,1,1-trichloroethane2 immiscible liquids with solute dissolved inside(2 phases)3 componentsThere is a dynamic equilibrium between the iodine dissolved in water and the iodine dissolved in 1,1,1-trichloroethane(phase equilibrium).23.1 Partit
3、ion of a Solute Between Two Immiscible Solvents (SB p.277)Partition LawExample5/21/20245/21/2024H+H+H+OH-OH-OH-New Way Chemistry for Hong Kong A-Level Book 23I2 dissolved in H2OI2 dissolved in CH3CCl323.1 Partition of a Solute Between Two Immiscible Solvents (SB p.278)Some Experimental resultsI2CH3C
4、Cl3(mol dm-3)I2H2O(mol dm-3)KD=0.0020.040.060.080.102.35 x 10-44.70 x 10-47.03 x 10-49.30 x 10-411.40 x 10-485.185.185.386.087.7Partition coefficient5/21/20245/21/2024H+H+H+OH-OH-OH-New Way Chemistry for Hong Kong A-Level Book 24At a given temperature,the concentration ratio of a solute in two immis
5、cible solvents is constant.Solute dissolved in solvent 1Solute dissolved in solvent 223.1 Partition of a Solute Between Two Immiscible Solvents (SB p.278)Partition Law KD=Where KD is the partition coefficient for the system and has no unit.5/21/20245/21/2024H+H+H+OH-OH-OH-New Way Chemistry for Hong
6、Kong A-Level Book 25The Partition Law will NOT hold when there is association or dissociation of the solute in one of the solvents.RemarkExampleThe distribution of ethanoic acid between water and benzene.In water,ethanoic acid exists in the form of monomers(it can form intermolecular hydrogen bonds
7、with water molecules).In benzene,ethanoic acid exists in the form of dimers.23.1 Partition of a Solute Between Two Immiscible Solvents (SB p.278)5/21/20245/21/2024H+H+H+OH-OH-OH-New Way Chemistry for Hong Kong A-Level Book 26Steps involved:Aqueous layer containing an organic product is transferred i
8、nto a separating funnel1,1,1-trichloromethane(or other organic solvent)is added to form 2 immiscible layersApparatus shaken to facilitate phase equilibrium to reach in a short time(most organic product extracted into the organic phase)1,1,1-trichloromethane is distilled off to obtain the organic pro
9、duct23.2 Solvent Extraction (SB p.279)Solvent Extraction5/21/20245/21/2024H+H+H+OH-OH-OH-New Way Chemistry for Hong Kong A-Level Book 2723.2 Solvent Extraction (SB p.279)Example 23-1An organic compound X has a partition coefficient of 30 in ethoxyethane and water.=30Suppose we have 3.1g of X in 50 c
10、m3 of water and 50 cm3 of ethoxyethane is then added to extract X from water.How much X is extracted by ethoxyethane?5/21/20245/21/2024H+H+H+OH-OH-OH-New Way Chemistry for Hong Kong A-Level Book 2823.2 Solvent Extraction (SB p.279)SolutionLet a g be the mass of X extracted by 50 cm3 of ethoxyethane,
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