Test for Alcohols, Aldehydes and Ketones

Topics: Alcohol, Ketone, Aldehyde Pages: 3 (558 words) Published: September 29, 2014
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, if one reactant is aldehyde or ketone, precipitation will be observed when 6 drops of 2,4-dinitrophenylhydrazine were added to the reactant.

Experimental

6 cylinders and 6 spoids were used for two experiments.
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 green. Test tube 2 - clear orange color of...

Cited: Solomons , T.W. Graham; Fryhle, Craig B (2004) Solomons & Fryhle Organic Chemistry. 8th ed. pp548-549 Wiley.
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Essay on Analysis of Ketones, Aldehydes, and Alcohols
  • Aldehydes and Ketones Essay
  • Aldehydes and Ketones Essay
  • Aldehydes and Ketones Essay
  • Test Essay
  • Reaction of Aldehydes and Ketones with Naoh Essay
  • Essay about Aldehydes, Ketones and Saccharides
  • Qualitative Tests for Carbonyls: Aldehydes vs. Ketones Essay

Become a StudyMode Member

Sign Up - It's Free