Experiment #08 Molecular Mass by Freezing Point Depression

Experiment #08 Molecular Mass by Freezing Point Depression...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Experiment 8 Molecular Mass by Freezing Point Depression Data and Calculations: Known Mass of empty test tube 18.24 g Mass of test tube + BHT 24.25 g Mass of test tube + BHT + naphthalene* 24.86 g Mass of BHT 6.02 g Mass of naphthalene 0.61 g Unknown Mass of empty test tube #2 18.69 g Mass of test tube #2 + BHT 24.84 g Mass of test tube #2 + BHT + phenyl salicylate* 25.9 g Mass of BHT 6.16 g Mass of phenyl salicylate* 1.05 g * Note: Naphthalene is known, phenyl salicylate is unknown Temperature Data: Time (sec) Pure BHT BHT + naphthalene BHT + phenyl salicylate 0 85.0 76.3 90.2 20 80.0 73.8 85.0 40 75.8 70.7 81.8 60 72.0 68.0 77.6 80 69.0 65.6 75.3 100 68.8 62.7 75.8 120 69.0 60.3 68.5 140 68.8 60.2 66.3 160 68.6 60.1 63.5 180 68.4 59.8 61.8 200 68.2 59.4 61.2 220 58.9 61.0 240 58.4 60.8 260 57.7 60.3 300 60.0 Known Solution Calculations: MW of naphthalene 128.17 g/mol
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: F.P. Depression 7.3 9.26 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 Cyclohexane 84.16 g/mol Stearic Acid 284.49 g/mol Phenyl Salicylate 214.22 g/mol o C k f of BHT o C/m FP BHT = 68.8 F.P. Solution = 61.5 F.P. Depression = FP BHT = 68.8 F.P. Solution = 61.3 F.P. Depression = o C o C o C o C 50 100 150 200 250 40 45 50 55 60 65 70 75 80 85 90 Freezing Point of Known Solution Column C Column D Time (sec) Temp (oC) 50 100 150 200 250 40 50 60 70 80 90 100 Freezing Point Unknown Solution Column Column Time (sec) 7.3 7.5 o C o C 300 C D 300 n C n E...
View Full Document

This note was uploaded on 06/02/2010 for the course CHEM 104 taught by Professor Any during the Spring '10 term at UNC Charlotte.

Page1 / 3

Experiment #08 Molecular Mass by Freezing Point Depression...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online