Describe reasonable sources of error in the quantitative analysis of the unknown’s composition.

. Empirical Data (include units where appropriate)
A. Instrument Parameters
1. Instrument Name __________________
2. Mobile phase gas ______ Flow Rate ______
3.. Column Description
a. Liquid stationary phase identity ________________
b. Column length and diameter ________________
3. Oven / Column Temperature _________________
4. Bridge Current _______________

B. Retention Times

Compound Name Standard A Standard B Standard C Standard D Standard E*

*Average of three trials

II. Physical Constants

Component MW bp (˚C) Other*
3-pentanone
toluene
methylcyclohexane
4-heptanone
cyclopentanone
*You may wish to report literature values related to polarity

References for physical constants:

Chemical Structures for Components:

III. Results

Instrument Calibration based on 1:1:1:1:1 molar composition of Standard E.

Component Peak Area Integrations
(use 4 sig fig) Response Factors (f)

(trial number ) 1 2 3 1 2 3 Avg f
2-pentanone
toluene
methylcyclohexane
4-heptanone
cyclopentanone

Unknown Analysis
Retention Times

Peak # Trial 1 Trial 2 Trial 3 Unknown Assignment
1
2
3

Integrations and Mole %

Component   Raw Peak Area
(use 4 sig fig) Corrected Peak Area
Mole %
(use 3 sig fig)
(trial number ) f 1 2 3 1 2 3  1 2  3  Avg
1)
2)
3)

IV. Discussion

Explain the elution order of the five known compounds.

Describe reasonable sources of error in the quantitative analysis of the unknown’s composition. HINT: Think about all aspects of the experiment, even ones done for you.