Quantitative Analysis
In Dumas method for nitrogen estimation, nitrogen is collected as:
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About This Question
- Subject
- chemistry
- Chapter
- purification and characterisation of organic compounds
- Topic
- quantitative analysis
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
N₂
The Dumas Method is a classical technique for estimating the percentage of nitrogen in an organic compound.
- Mechanism: The compound is heated with Cupric oxide (CuO) in an atmosphere of Carbon dioxide (CO2). Any nitrogen present is converted to Nitrogen gas (N2).
- Collection: The gas mixture is passed through a solution of Potassium hydroxide (KOH), which absorbs CO2. The pure nitrogen gas is collected in a graduated tube (Nitrometer) over KOH solution. By measuring the volume of N2 at STP, the percentage of nitrogen can be calculated.
This medium difficulty chemistry question is from the chapter purification and characterisation of organic compounds, covering the topic of quantitative analysis. It appeared in the 2025 exam.
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