3. Discuss the specific results of your iron (III) chloride test. What did you s
ID: 569763 • Letter: 3
Question
3. Discuss the specific results of your iron (III) chloride test. What did you see? What do the colors of each tube mean? What does this information suggest about the purity of your aspirin? 6-8 centences Please type here
Iron (III) Chloride Observations:
Test Tube
Observations before adding iron (III) chloride
Observations after adding iron (III) chloride
Salicylic acid in DI water
Small particles floating in the mixture (low solubility.)
Forms a dark purple solution. Limiting reagent-Tron(III) chloride.
Excess reagent- salicylic acid.
Aspirin in DI water
Small particles floating in the mixture (low solubility)
Forms a very light pink solution
The Aspirin doesn’t react
DI water
Plain transparent solution
No changes. same
Test Tube
Observations before adding iron (III) chloride
Observations after adding iron (III) chloride
Salicylic acid in DI water
Small particles floating in the mixture (low solubility.)
Forms a dark purple solution. Limiting reagent-Tron(III) chloride.
Excess reagent- salicylic acid.
Aspirin in DI water
Small particles floating in the mixture (low solubility)
Forms a very light pink solution
The Aspirin doesn’t react
DI water
Plain transparent solution
No changes. same
Explanation / Answer
The Iron (III) chloride test is used to test the presence of phenols in the compound. The formation of red, green, blue or purple color indicates the presence of the phenol in the given compound. the salicylic acid contains one carboxylic acid group (COOH) and one phenolic (OH), group. This phenolic OH group reacts with FeCl3 to form a complex which is dark purple in color and thus confirms the presence of phenol in the salicylic acid. In case of aspirin, the OH group is acetylated and thus no more free OH group is present so it does not react with FeCl3 and thereby gives the negative test for Fecl3 confirming the absence of phenol group in the aspirin.
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