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Freezing Point Depression Lab

Freezing Point Depression Lab - Experimental Data and...

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Experimental Data and Graphs Mass of cyclohexanol: 9.3 grams Time (s) Temperature  ( C) 10 38 20 36 30 34 40 33 50 32 60 31 70 30 80 29 90 28.5 100 28 110 27 120 27 130 26 140 26 150 25.5 160 25 170 24 180 24 190 24 200 24 210 23 220 22.5 230 22 240 22 250 21 260 21 270 21 280 21 Mass of solute added to cyclohexanol: .71 g Code Number of Solute Used: B Time (s) Temperature  ( C) 10 60 20 51 30 45 40 40 50 36 60 34 70 32 80 30 90 29 100 27 110 26 120 26 130 25 140 25 150 24 160 23 170 23 180 23 190 22 200 22 210 22 220 21.5 230 21 240 20.5 250 20 260 20
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Red=cyclohexanol+B Blue=cyclohexanol Freezing Point of Cyclohexanol: 24  C Freezing Point of Cyclohexanol Solution: 10  C T = 14  C Calculations: 3. K f  of cyclohexanol = 39.4  C/m Molality =  Δ T f  / k f   m = 14  ° C / (39.4  ° C/m) m = 0.355 mol/kg 4. moles of solute = (molality)(kg of solvent used)
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moles of solute = (0. 0.355 mol/kg)(0.0093 kg) 0.0033015 moles of solute 5. molar mass = (grams of solute added) / (moles of solute) molar mass = (0.71 grams) / (0. 0033 moles of solute) molar mass = 215.15 g/mol
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