CHEM 103 EXPERIMENT 8 MOLECULAR MASS BY FREEZING POINT
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Course
CHEM 103
Institution
CHEM 103
CHEM 103 EXPERIMENT 8 MOLECULAR MASS BY FREEZING POINT/CHEM 103 EXPERIMENT 8 MOLECULAR MASS BY FREEZING POINT/CHEM 103 EXPERIMENT 8 MOLECULAR MASS BY FREEZING POINT
chem 103 experiment 8 molecular mass by freezing point
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Experiment 8
Molecular Mass by Freezing Point Depression
Data and Calculations:
Known
Mass of empty test tube 18.235 g
Mass of test tube + BHT 24.251 g
Mass of test tube + BHT + naphthalene* 24.859 g
Mass of BHT 6.016 g
Mass of naphthalene 0.608 g
Unknown
Mass of empty test tube #2 18.689 g
Mass of test tube #2 + BHT 24.844 g
Mass of test tube #2 + BHT + phenyl salicylate* 25.895 g
Mass of BHT 6.155 g
Mass of phenyl salicylate* 1.051 g
* Note: Naphthalene is known, phenyl salicylate is unknown
Known Solution Calculations:
MW of naphthalene 128.17 g/mol
F.P. Depression 7.3 oC
o
kf of BHT 9.26 C/m
Unknown Solution Calculations:
F.P Depression 7.5
MW of Unknown 210.8 g/mol
Known MW 214.22 g/mol
Percent Error 1.61 %
Unknown Solids List:
Naphthalene 128.17 g/mol
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