II. How did you know (or would you know) if your steam distillation extracted li

Question

II. How did you know (or would you know) if your steam distillation extracted limonene and not something else? Post-Lab Questions: 1.) Orange oil is made up of a number of organic compounds, but only one (limonene) is predominant, and is a liquid with specific optical rotation of +125.6. On the basis of your value, is the orange oil pure? 2.) Fill out the table about IR data: (Use Zubrick p280, McMurry p439 as a referencel) Absorbance Present in your (cm31)sample? (yes/no) 2 (yes/no) What functional groups are indicated by peaks in this region? 3010-3050 2950-2980 1750-1730 1630-1675

Explanation / Answer

H. By observing the boilng point which is 176 0C.

1. Its not pure since, limonene specific rotation is 87-102.

2. 3010-3050 corresponds to =C-H stretche; 2950- 2980 is due to CH stretche and 1630- 1675 is for C=C stretch.

1750-1730 which is. not present in limonene

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