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Mark the incorrect statement in nitrogen Kjeldahl's method of estimation
- a)Nitrogen gas is collected over caustic potash solution
- b)Potassium sulphate is used as boiling point elevator of H2SO4
- c)Copper sulphate or mercury acts as a catalyst
- d)Nitrogen is quantitatively decomposed to give ammonium sulphate
Correct answer is option 'A'. Can you explain this answer?
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Mark the incorrect statement in nitrogen Kjeldahls method of estimatio...
In case of kjeldahl's method the percentage of N2 is then calculated from the amount of NH3
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Mark the incorrect statement in nitrogen Kjeldahls method of estimatio...
The Incorrect Statement: Nitrogen gas is collected over caustic potash solution.
Explanation:
In the Kjeldahl method of estimation for nitrogen, the following steps are involved:
1. Digestion: The sample containing the nitrogen compound is digested with concentrated sulfuric acid (H2SO4) in the presence of a catalyst. The catalyst can be copper sulfate or mercury.
2. Decomposition: During the digestion process, the nitrogen in the sample is converted into ammonium sulfate (NH4)2SO4. This compound is formed due to the oxidizing action of sulfuric acid on the nitrogen compound.
3. Distillation: After digestion, the mixture is diluted with water and heated. The ammonium sulfate is then distilled by adding an alkaline solution, usually sodium hydroxide (NaOH). The heat causes the ammonium ions (NH4+) to be converted back into ammonia (NH3).
4. Collection of Ammonia: The ammonia gas is collected by passing it through a receiving flask containing a known volume of acid. The acid used is not caustic potash solution (KOH), but rather a strong acid like sulfuric acid (H2SO4). The ammonia reacts with the acid to form ammonium sulfate.
5. Titration: The excess acid in the receiving flask is then titrated with a standardized solution of a base, such as sodium hydroxide (NaOH). The amount of base required to neutralize the acid is proportional to the amount of nitrogen present in the sample.
Conclusion:
The incorrect statement in the given options is option A. Nitrogen gas is not collected over caustic potash solution, but rather over a strong acid like sulfuric acid. The ammonia gas formed during the distillation process reacts with the acid to form ammonium sulfate, which is then quantitatively determined by titration.
Explanation:
In the Kjeldahl method of estimation for nitrogen, the following steps are involved:
1. Digestion: The sample containing the nitrogen compound is digested with concentrated sulfuric acid (H2SO4) in the presence of a catalyst. The catalyst can be copper sulfate or mercury.
2. Decomposition: During the digestion process, the nitrogen in the sample is converted into ammonium sulfate (NH4)2SO4. This compound is formed due to the oxidizing action of sulfuric acid on the nitrogen compound.
3. Distillation: After digestion, the mixture is diluted with water and heated. The ammonium sulfate is then distilled by adding an alkaline solution, usually sodium hydroxide (NaOH). The heat causes the ammonium ions (NH4+) to be converted back into ammonia (NH3).
4. Collection of Ammonia: The ammonia gas is collected by passing it through a receiving flask containing a known volume of acid. The acid used is not caustic potash solution (KOH), but rather a strong acid like sulfuric acid (H2SO4). The ammonia reacts with the acid to form ammonium sulfate.
5. Titration: The excess acid in the receiving flask is then titrated with a standardized solution of a base, such as sodium hydroxide (NaOH). The amount of base required to neutralize the acid is proportional to the amount of nitrogen present in the sample.
Conclusion:
The incorrect statement in the given options is option A. Nitrogen gas is not collected over caustic potash solution, but rather over a strong acid like sulfuric acid. The ammonia gas formed during the distillation process reacts with the acid to form ammonium sulfate, which is then quantitatively determined by titration.
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Mark the incorrect statement in nitrogen Kjeldahls method of estimationa)Nitrogen gas is collected over caustic potash solutionb)Potassium sulphate is used as boiling point elevator of H2SO4c)Copper sulphate or mercury acts as a catalystd)Nitrogen is quantitatively decomposed to give ammonium sulphateCorrect answer is option 'A'. Can you explain this answer?
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Mark the incorrect statement in nitrogen Kjeldahls method of estimationa)Nitrogen gas is collected over caustic potash solutionb)Potassium sulphate is used as boiling point elevator of H2SO4c)Copper sulphate or mercury acts as a catalystd)Nitrogen is quantitatively decomposed to give ammonium sulphateCorrect answer is option 'A'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Mark the incorrect statement in nitrogen Kjeldahls method of estimationa)Nitrogen gas is collected over caustic potash solutionb)Potassium sulphate is used as boiling point elevator of H2SO4c)Copper sulphate or mercury acts as a catalystd)Nitrogen is quantitatively decomposed to give ammonium sulphateCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Mark the incorrect statement in nitrogen Kjeldahls method of estimationa)Nitrogen gas is collected over caustic potash solutionb)Potassium sulphate is used as boiling point elevator of H2SO4c)Copper sulphate or mercury acts as a catalystd)Nitrogen is quantitatively decomposed to give ammonium sulphateCorrect answer is option 'A'. Can you explain this answer?.
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