Chapter 12(my version)

# Chapter 12(my version) - Tf = Kf m i Tb = Kb m i 12.6 fp...

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Chapter 12 Colligative Properties Boiling Point Elevation And Freezing Point Depression

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Colligative Properties: dependent on concentration of solution. 1) Freezing Point Depression A solute added to a solvent will decrease the freezing point of a solvent. Salting your sidewalk or roads in the winter to prevent ice. 2) Boiling Point Elevation A solute will increase the bp of the solvent. Adding Salt to boiling water, adding antifreeze to the water in your radiator.
Van’t Hoff Factor Solute Solvent Electrolyte i C 6 H 12 O 6 H 2 O Non-electrolyte 1 NaCl H 2 O Strong 2 CaBr 2 H 2 O Strong 3 MgSO 4 H 2 O Strong 2

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Freezing Point Depression Boiling Point Elevation Tf = T f o - Tf ∆Tb = T b o - Tf

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Unformatted text preview: Tf = Kf . m . i Tb = Kb . m . i 12.6 fp Depression EX 1 7.85g of a nonelectrolyte is dissolved in 301 g of benzene. The fp of the soln is 1.05 o C below the fp of pure benzene. Calculate the MM of the solute. Kf (benzene) = 5.12 o C/ m Answer: 127 g/mol Fp Depression EX 2 Anthraquinone contains only carbon, hydrogen, and oxygen and has an empirical formula of C 7 H 4 O. The freezing point of camphor is lowered by 22.3 o C when 1.32g anthraquinone is dissolved in 11.4 g camphor. Determine the molecular formula of anthraquinone. K f (camphor) = 40. o C/ m Answer: C 14 H 8 O 2...
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## This note was uploaded on 01/17/2012 for the course CHEM 4A taught by Professor Apriladrian during the Spring '11 term at UC Merced.

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Chapter 12(my version) - Tf = Kf m i Tb = Kb m i 12.6 fp...

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