Acetophenone Synthesis Lab
Abstract
Oxidation was found for primary alcohol. When 6 drops of potassium dichromate and 1 drop of concentrated sulfuric acid were added to 1-pentanol, the color of 1-pentaol turned into dark green. In second experiment, precipitation was found when 6 drops of 2,4-dinitrophenylhydrazine were added to both 5 drops of benzaldehyde and 5 drops of acetophenone. Based on these data, it is possible to find alcohol by oxidation and aldehyde by observing precipitation
Introduction This experiments is to find if one substance has alcohols, aldehydes or ketones. If one reactant is alcohol, the color of the reactant will be turned into green when 6 drops of potassium dichromate and 1 drop of concentrated sulfuric acid were added. Also, …show more content…
6 cylinders were cleaned and completely dried before dropping solutions.
Experiment 1
5 drops of 1-pentaol was dropped in test tube 1.
5 drops of benzaldehyde was dropped in test tube 2.
5 drops of acetophenone was dropped in test tube 3.
6 drops of potassium dichromate and 1 drop of concentrated sulfuric acid were added to the solution in each test tube 1,2 and 3.
(concentrated sulfuric acid was very carefully handled because it was extremely corrosive and powerful oxidizing agent.) test tube 1, 2, 3 were observed if there were any chemical changes.
Experiment 2
5 drops of 1-pentaol was dropped in test tube 4.
5 drops of benzaldehyde was dropped in test tube 5.
5 drops of acetophenone was dropped in test tube 6.
6 drops of 2,4-dinitrophenylhydrazine was added to the solution in each test tube 4,5 and 6. test tube 4, 5, 6 were observed if there were any chemical changes.
Results
Test tube 1 - the color of solution was turned into dark …show more content…
Test tube 4 - clear yellow color of solution was observed.
Test tube 5 - orange color solution and red precipitate was observed.
Test tube 6 - dark orange color solution and red precipitate was observed.
The color change of the test tube 1 indicates primary alcohol was oxidized. The formation of a precipitate of the test tube 5 and 6 shows aldehyde and ketone form a precipitate when react with 2,4-dinitrophenylhydrazine.
Discussion
In first experiment, only the color of the product of alcohol was turned into green. This reaction seems oxidization. According to T.W. Graham Solomons, primary alcohols can be oxidized to aldehydes and carboxylic acids by chromate and produce ketone. (page. 548)
The color change was observed because of reduction of Cr2O72- to Cr3+.
K2Cr2O7 O
CH2CH2CH2CH2CH2OH -----------------→ CH2CH2CH2CH2COH H2SO4
In second experiment, precipitation was observed. This proves that two test solution include aldehyde or ketone. This reaction is condensation reaction. The color of the precipitate was both red. It is because both reactant is
Oxidation was found for primary alcohol. When 6 drops of potassium dichromate and 1 drop of concentrated sulfuric acid were added to 1-pentanol, the color of 1-pentaol turned into dark green. In second experiment, precipitation was found when 6 drops of 2,4-dinitrophenylhydrazine were added to both 5 drops of benzaldehyde and 5 drops of acetophenone. Based on these data, it is possible to find alcohol by oxidation and aldehyde by observing precipitation
Introduction This experiments is to find if one substance has alcohols, aldehydes or ketones. If one reactant is alcohol, the color of the reactant will be turned into green when 6 drops of potassium dichromate and 1 drop of concentrated sulfuric acid were added. Also, …show more content…
6 cylinders were cleaned and completely dried before dropping solutions.
Experiment 1
5 drops of 1-pentaol was dropped in test tube 1.
5 drops of benzaldehyde was dropped in test tube 2.
5 drops of acetophenone was dropped in test tube 3.
6 drops of potassium dichromate and 1 drop of concentrated sulfuric acid were added to the solution in each test tube 1,2 and 3.
(concentrated sulfuric acid was very carefully handled because it was extremely corrosive and powerful oxidizing agent.) test tube 1, 2, 3 were observed if there were any chemical changes.
Experiment 2
5 drops of 1-pentaol was dropped in test tube 4.
5 drops of benzaldehyde was dropped in test tube 5.
5 drops of acetophenone was dropped in test tube 6.
6 drops of 2,4-dinitrophenylhydrazine was added to the solution in each test tube 4,5 and 6. test tube 4, 5, 6 were observed if there were any chemical changes.
Results
Test tube 1 - the color of solution was turned into dark …show more content…
Test tube 4 - clear yellow color of solution was observed.
Test tube 5 - orange color solution and red precipitate was observed.
Test tube 6 - dark orange color solution and red precipitate was observed.
The color change of the test tube 1 indicates primary alcohol was oxidized. The formation of a precipitate of the test tube 5 and 6 shows aldehyde and ketone form a precipitate when react with 2,4-dinitrophenylhydrazine.
Discussion
In first experiment, only the color of the product of alcohol was turned into green. This reaction seems oxidization. According to T.W. Graham Solomons, primary alcohols can be oxidized to aldehydes and carboxylic acids by chromate and produce ketone. (page. 548)
The color change was observed because of reduction of Cr2O72- to Cr3+.
K2Cr2O7 O
CH2CH2CH2CH2CH2OH -----------------→ CH2CH2CH2CH2COH H2SO4
In second experiment, precipitation was observed. This proves that two test solution include aldehyde or ketone. This reaction is condensation reaction. The color of the precipitate was both red. It is because both reactant is