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Detection of Elements: Lassaigne’s Test Video Lecture | Organic Chemistry

Q: 3. What are the steps involved in Lassaigne's test?

Ans. The steps involved in Lassaigne's test are as follows:1. Take a small amount of the organic compound and mix it with powdered sodium metal.2. Heat the mixture strongly in a test tube.3. Add distilled water to the mixture and shake it vigorously.4. Filter the mixture to remove any insoluble impurities.5. Transfer the filtrate to a new test tube and add a few drops of ferrous sulfate solution.6. Acidify the solution with dilute sulfuric acid and add a few drops of potassium permanganate solution.7. Observe any color changes or precipitates formed, which indicate the presence of specific elements.

FAQs on Detection of Elements: Lassaigne’s Test Video Lecture - Organic Chemistry

1. What is Lassaigne's test?

Ans. Lassaigne's test is a chemical test used to detect the presence of elements like nitrogen, sulfur, halogens, and carbon in organic compounds. It involves the conversion of these elements into water-soluble compounds that can be easily detected.

2. How is Lassaigne's test performed?

Ans. Lassaigne's test is performed by taking a small amount of the organic compound and heating it with sodium metal. This converts the elements present in the compound into sodium salts. The resulting mixture is then dissolved in water and treated with various reagents to identify the specific elements.

3. What are the steps involved in Lassaigne's test?

Ans. The steps involved in Lassaigne's test are as follows: 1. Take a small amount of the organic compound and mix it with powdered sodium metal. 2. Heat the mixture strongly in a test tube. 3. Add distilled water to the mixture and shake it vigorously. 4. Filter the mixture to remove any insoluble impurities. 5. Transfer the filtrate to a new test tube and add a few drops of ferrous sulfate solution. 6. Acidify the solution with dilute sulfuric acid and add a few drops of potassium permanganate solution. 7. Observe any color changes or precipitates formed, which indicate the presence of specific elements.

4. What elements can be detected using Lassaigne's test?

Ans. Lassaigne's test can detect elements like nitrogen, sulfur, halogens (chlorine, bromine, iodine), and carbon in organic compounds. By converting these elements into water-soluble compounds, their presence can be identified through various chemical reactions and observations.

5. What are the applications of Lassaigne's test?

Ans. Lassaigne's test is widely used in organic chemistry for the qualitative detection of elements in organic compounds. It helps in identifying the presence of specific elements, which is crucial in determining the structure and properties of organic molecules. This test is particularly useful in forensic analysis, drug testing, and environmental monitoring where the identification of elements is essential.

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Oct 05, 2025 Last updated

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