Ch11c - (aq) 1.0 m NaCl (aq) 0.1 m Na 3 PO 4 (aq) FP trend?...

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Solutions 3 1) Von’t Hoff Factor 2) Colligative Properties
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Van’t Hoff Factor (i solute ) Number of particles formed in solution per formula unit of solute Van’t Hoff Factor? C 6 H 12 O 6 NaCl CaCl 2 Na 3 PO 4 (NH 4 ) 2 SO 4
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Colligative Properties Properties of the solvent that change upon addition of solute Extent of change depends on number of solute particles in solution (not their identity)
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Vapor Pressure Lowering Adding a nonvolatile solute lowers the VP of the solution VP Trend? VP Trend? H 2 O 0.1 m C 6 H 12 O 6 (aq) 0.1 m NaCl(aq) 0.1 m NaCl(aq) 0.5 m NaCl (aq) 0.1 m CaCl 2 (aq) 1.0 m NaCl (aq) 0.1 m Na 3 PO 4 (aq)
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Boiling
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Vapor Pressure Curve
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Phase Diagram - Water
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Solute Effect on Freezing Point and Boiling Point FP Depression Solutes lower FP of solution ∆T f = i K f m BP Elevation Solutes raise BP of solution ∆T b = i K b m
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List 1 List 2 H 2 O 0.1 m C 6 H 12 O 6 (aq) 0.1 m NaCl(aq) 0.1 m NaCl(aq) 0.5 m NaCl (aq) 0.1 m CaCl 2
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Unformatted text preview: (aq) 1.0 m NaCl (aq) 0.1 m Na 3 PO 4 (aq) FP trend? BP trend? BP of an aqueous solution with molecular solute is 100.85C. What is the molality of the solution? 39.5 g of C 2 H 6 O 2 dissolved in 750 g water. Find the FP and BP of the solution. (K b of H 2 O = 0.52 C kg / mol) (K f of H 2 O = 1.86 C kg / mol) 0.50 g of a molecular solid is added to 7.50 g lauric acid (K f = 3.90C kg /mol). The lauric acids freezing point drops from 36.0C to 34.2C. 1)Molality of solid? 2)Molar mass of solid? Osmosis - Microscopic Osmosis = i M R T Solutions Summary Solute behavior: ionic vs. molecular Heat of Solution Concentration: M, m, %, mol fraction Solubility: nature of solvent, nature of solute, temperature, pressure Colligative Props: VP, BP, FP, OP...
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Ch11c - (aq) 1.0 m NaCl (aq) 0.1 m Na 3 PO 4 (aq) FP trend?...

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