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Oxidize ethanol and then test the product to determine whether it has been oxidized to ethanol or oxidized to ethanoic acid.

Extracts from this document...

Introduction

AS CHEMISTRY: Assessed Practical (Skill I) The purpose of the experiment In this experiment is to oxidize ethanol and then to test the product to determine whether it has been oxidized to ethanol or oxidized to ethanoic acid. The request of the experiment During the experiment, you will need to record all your observations clearly in an appropriate format. Record these appropriately in the space below. You should also consider the hazards associated with the materials and techniques used within the experiment and record it. Introduction 2, 4-DNPH (2, 4 dinitrophenylhydrazine) � a kind of indicator, colorless liquid. CH3CH2OH (ethanol) �it is a clear, colorless liquid with a characteristic, agreeable odor. (http://scifun.chem.wisc.edu/chemweek/ethanol/ethanol.html) Required Equation CH3CH2OH +[O] � CH3CHO + H2O CH3CH2OH +2[O] � CH3COOH + H2O Material 1. Solvent �The distilled water need about 15cm�(15ml). 2. Ethanol (CH3CH2OH) �It is used to influence the solution, which in the dropping funnel. 3. Concentrated sulphuric acid (H2SO4) �It could use to be dilute in the pear shaped flask with the distilled water. ...read more.

Middle

5. Carry out the following tests on the distillate and record your observations. And the picture is shows how to setting up the equipment for this experiment was in the top. Safety In this experiment there is some hazard of the chemicals used in the experiment. Hazard in this experiment: 1. Before start the experiment, ensure that all of the glass joints are greased. Keep the experiment is safety. 2. In the step1, make sure the order for put the material. Because used the water to dilute the concentrated sulphuric acid (H2SO4). It can set free a large number of calorific capacities. So in that time is dangerous if you not careful to be scalded. 3. When used the Bunsen burner warm the acid. Make sure don't touch the equipment. Because is hot in that time. Suggest and justify improvement to the hazard in this experiment: 1. Before the experiment. Ensure that all of the glass joints are greased. 2. Remember the order to put the material in to the pear shaped flask. 3. When used the Bunsen burner warm the acid. ...read more.

Conclusion

�the product which been collected is colourless liquid. Used the material, which have been collect in this reaction. 1. Test for the presence of a carbonyl group to find out whether ethanal had been formed. ----Put 5 cm� of 2-4,initrophenylhydrazine in a test tube and cautiously adds 5 drops of the distillate. �In the text tube the solution is change the colour from the colourless to the yellow and there is also has the yellow precipitate has been product in the same time. 2. Text for the presence of an acid group to find out whether ethanoic acid had been formed. ----Put 2 drops of the distillate in a test tube and used the PH paper to test. �the PH paper is change the normal color yellow not very much ,because it is only change a bit dark of the colour ,is likely a kind of dark yellow. And then check the PH value is about 4 or 5. Conclusion Use the results to decide whether an aldehyde or a carboxylic acid has been formed during this experiment. �in this experiment the most has been formed is the aldehyde and also has a little carboxylic acid. ...read more.

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