experiment 23 overview. goal determine molar mass of s x and the value of x
DESCRIPTION
METHOD FREEZING POINT DEPRESSIONTRANSCRIPT
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EXPERIMENT 23
OVERVIEW
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GOAL
DETERMINE MOLAR MASS OF Sx
AND THE VALUE OF x
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METHOD
FREEZING POINT DEPRESSION
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Freezing point depression can be used to find molar mass of solute
∆Tf ― experiments
i ― electrolyte or nonelectrolyte
Kf ― table or reference book
f
f
KiΔT
solventofkilogramsoluteofmolesm
f
fff Ki
ΔTm m Ki ΔT
soluteofmolessolute of masssolute of massmolar
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Solute: Sx Solvent: Naphthalene
i = 1 Kf: given
ΔTf = Tf,solvent − Tf,solution
Tf,solvent: Part A
Tf,solution: Part B
Kilogram of naphthalene: balance
Mass of Sx: balance
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PROCEDURE AND SAFETY• FOLLOW PROCEDURES IN LAB MANUAL
EXCEPT: WORK AT BENCH
• USE THE SAME THERMOMETER
• PLACE TUBE ON BALANCE PROPERLY
• COVER LIDS AFTER WEIGHING
• DO NOT MIX SPETULAS
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PROCEDURE AND SAFETY• ALL WASTE GOES IN BROWN WASTE
BOTTLE IN HOOD, NOT SINK! USE ACETONE TO RINSE RESIDUE INTO PLASTIC WASTE CONTAINER
• STAY AWAY FROM THE HOTPLATE WHILE COOLING
• RETURN ALL COMMON ITEMS
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PROCEDURE AND SAFETY
•CLEAN YOUR AREA BEFORE LEAVING AND ASK FOR INSPECTION
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DATA ANALYSIS
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Tem
pera
ture
(°C
)
Time (min)
Tf
Cooling Curve
liquid
liquid + solidsolid
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GRAPHING• USE SOFTWARE TO FIND Tf
• USE FULL PAGE: CHOOSE SCALE PROPERLY
• GIVE GRAPH A TITLE
• LABEL AXIS, ADD LEGEND
• EXAMPLE
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Kaleidagraph
SigmaPlot
Origin
Graphing Software