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Post-Laboratory Discussion in Chemistry

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Marc Chaddie Cristobal

on 16 February 2014

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Transcript of Post-Laboratory Discussion in Chemistry

Lucas Test
Reagents:
- n-butyl alcohol, benzyl alcohol, sec-butyl alcohol, tert-butyl alcohol, Lucas reagent
Chromic Acid Test
Reagents:
ethyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, 5% potassium dichromate, 5% sulfuric acid
Esterification
Reagents:
- ethyl alcohol, tert-butyl alcohol, acetic acid, sulfuric acid
Special Test for Methyl Alcohol
Reagents:
- methyl alcohol, distilled water, 0.5% resocrinol, concentrated sulfuric acid
Iodoform Test
Reagents:
- ethyl alcohol, isopropyl alcohol, methyl alcohol, iodine solution, 10% NaOH
Acrolein Test
Reagents:
- glycerol, KHSO
Post-Laboratory Discussion in Chemistry
(Alcohols)
4
Results:
Ethyl alcohol
- Color change from Orange to green/blue green within 5s
N-butyl alcohol
- Color change from Orange to green/blue green within 5s
Tert-butyl alcohol
- Color remained orange (NO REACTION)
Sec-butyl alcohol
- Color change from Orange to green/blue green within 5s



Explanation:
- Ethyl alcohol and n-butyl alcohol give out a positive result because both of them are primary alcohols. Sec-butyl alcohol also shows a positive result because it is a secondary alcohol. Tert-butyl alcohol doesn't show any reaction because it is a tertiary alcohol.
Results:
N-butyl alcohol:
- Solution remains clear. (NO REACTION)
Benzyl alcohol:
- Forms a cloudy solution within 1 to 2 minutes.
Sec-butyl alcohol:
- Forms a cloudy solution within 5 to 10 minutes.
Tert-butyl alcohol:
- Forms a cloudy solution within 1 to 2 minutes.
Explanation:
N-butyl alcohol:
- Not usually reactive enough to form a primary halogenoalkane
Benzyl alcohol:
- Reactive enough
Sec-butyl alcohol:
- May be reactive enough to slowly form.
Tert-butyl alcohol:
- Reactive enough to immediately form an insoluble tertiary halogenoalkane.
Results:
Ethyl alcohol:
- Produced a pleasant odor at 121ºC.
Tert-butyl alcohol:
- Produced an unpleasant odor.
Result:
- Produced light brown at the top layer and transparent at the bottom.
Results:
Ethyl alcohol:
- Formation of a yellow precipitate or suspension of iodoform.
Isopropyl alcohol:
- Formation of a yellow precipitate or suspension of iodoform.
Methyl alcohol:
- No formation of yellow precipitate.

Explanation:
- If the alcohol contains a methyl group attached to a carbon that also has a hydrogen and an OH group then it will give a positive iodoform test.


Result:
- Produced a burnt fat odor.
Explanation:
- When a fat is heated strongly in the presence of a dehydrating agent such as Potassium bisulfate, the glycerol portion of the molecule is dehydrated to form the unsaturated aldehyde, acrolein (CH2=CH-CHO), which has the peculiar odor of burnt grease. 
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