Unknown Mixture Test the unknown mixture, but this time inject 0.3 jL. When the

Question

Unknown Mixture Test the unknown mixture, but this time inject 0.3 jL. When the run is but t to test your pea completed, change its name to Unkn off the Mini GC, turn off LabQuest, clean the needle with acetone and store i, when r done DATA TABLE CompoundRetention time (min) Peak (mv) Peak Area Boling points 1-pentanol toluene ethanol 23SS unknown #4 3480 DATA ANALYSIS Discuss the retention times of the substances with regard to their molecular weights. Describe any pattern that emerges. (1. 2. Discuss the retention times of the substances with regard to their boiling Describe any pattern that emerges. 3. Identify the substances that are present in your unknown mixture. Support your identification

Explanation / Answer

Molecular Weight

1. From the table, it is clear that retention time is decreasing as molecular mass is decreasing. Here toluene is an exceptional case whose retention time is not satisfying the particular order.

2. Again from the table, retention time is decreasing as boiling point of substance is decreasing.

3. Since retention time of Unknow is very near to toluene, most probably unknown contains toluene.

Compound Retention time Boiling point

Molecular Weight

1 Pentanol 5.493 138 88.15 Toluene 2.9 110 92.14 Ethanol 1.01 78 46.07 Unknown 3.88

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