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test-for-phenolic-group
The test for phenolic group is a qualitative test used to determine the presence of a phenolic group in a molecule. The test uses a reagent, usually ferric chloride, to convert any phenols in the molecule into phenolates. These phenolates will then form a violet color with the addition of a second reagent, usually potassium iodide.
Test for Phenol
Phenol is a toxic organic compound that is widely used as a disinfectant and preservative. It is also found in cigarette smoke and automobile exhaust.
The phenol test is a qualitative test used to determine the presence of phenol in a sample. A small amount of the sample is placed on a filter paper and a few drops of concentrated sulfuric acid are added. If phenol is present, a purple color will develop on the paper.
Litmus Test
A litmus test is a type of chemical test used to determine the pH of a solution. It typically involves the use of a strip of paper that has been impregnated with a pH indicator. The strip is then dipped into the solution and the color of the strip is compared to a chart that lists the colors associated with different pH values.
Ferric Chloride Test
Ferric chloride is a test for the presence of iron. A drop of ferric chloride is added to a sample of the substance being tested. If iron is present, the solution will change from colorless to a deep red.
Phthalein Dye Test
The phthalein dye test is a test used to determine the presence of certain proteins in a solution. The test uses a dye that is changed to a different color when it comes into contact with a protein.
Observe the Colour Change
The colour change should be fairly dramatic, going from a light pink to a dark red.
Bromine Water Test
In this test, you will use bromine water to detect the presence of starch.
Starch is a type of carbohydrate that is found in plants. It is used by plants to store energy.
Bromine water is a solution that contains bromine ions (Br-) and water molecules (H2O).
When bromine water is mixed with starch, the starch will react with the bromine ions to form a blue-green complex.
This test is used to detect the presence of starch in foods.
To perform this test, you will need:
a test tube
bromine water
starch
water
To perform the test:
1. Add 2-3 drops of bromine water to a test tube.
2. Add a few drops of starch to the test tube.
3. Add a few drops of water to the test tube.
4. Swirl the test tube to mix the ingredients.
5. Watch the test tube for a few minutes.
The blue-green complex will form as the starch reacts with the bromine water.
Phenolic Samples should be handled Carefully.
Phenolic compounds are highly reactive and can easily cause skin and eye irritation.
