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In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved
from 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soil
is :
from 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soil
is :
- a)35.33
- b)43.33
- c)37.33
- d)45.33
Correct answer is option 'C'. Can you explain this answer?
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In the Kjeldahls method for estimation of nitrogen present in a soil s...
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In the Kjeldahls method for estimation of nitrogen present in a soil s...
Kjeldahl's Method for Nitrogen Estimation in Soil Sample
In the Kjeldahl's method, nitrogen estimation is done by the following steps:
- Digestion: The soil sample is digested with concentrated sulfuric acid (H2SO4) in the presence of a catalyst such as copper sulfate (CuSO4). This converts all the nitrogen present in the soil to ammonium sulfate (NH4)2SO4.
- Neutralization: The ammonia (NH3) released during digestion is then distilled out and trapped in a solution of boric acid (H3BO3) to form ammonium borate (NH4)3BO3. The excess acid is then neutralized with sodium hydroxide (NaOH) solution.
- Titration: The ammonium borate solution is then titrated with standardized hydrochloric acid (HCl) solution to determine the amount of ammonia present in the sample.
Calculation:
Given, 0.75 g of soil sample neutralized 10 mL of 1M H2SO4.
Molar mass of NH3 = 17 g/mol
Molar mass of N = 14 g/mol
The amount of ammonia produced from 0.75 g of soil sample = 10 mL of 1M H2SO4
1 mole of H2SO4 produces 2 moles of NH3
So, the amount of NH3 produced = 2 x 1 x 10/1000 = 0.02 moles
The amount of nitrogen present in the sample = 0.02 x 14 = 0.28 g
The percentage of nitrogen in the soil sample = (0.28/0.75) x 100 = 37.33%
Therefore, the correct answer is option C) 37.33%.
In the Kjeldahl's method, nitrogen estimation is done by the following steps:
- Digestion: The soil sample is digested with concentrated sulfuric acid (H2SO4) in the presence of a catalyst such as copper sulfate (CuSO4). This converts all the nitrogen present in the soil to ammonium sulfate (NH4)2SO4.
- Neutralization: The ammonia (NH3) released during digestion is then distilled out and trapped in a solution of boric acid (H3BO3) to form ammonium borate (NH4)3BO3. The excess acid is then neutralized with sodium hydroxide (NaOH) solution.
- Titration: The ammonium borate solution is then titrated with standardized hydrochloric acid (HCl) solution to determine the amount of ammonia present in the sample.
Calculation:
Given, 0.75 g of soil sample neutralized 10 mL of 1M H2SO4.
Molar mass of NH3 = 17 g/mol
Molar mass of N = 14 g/mol
The amount of ammonia produced from 0.75 g of soil sample = 10 mL of 1M H2SO4
1 mole of H2SO4 produces 2 moles of NH3
So, the amount of NH3 produced = 2 x 1 x 10/1000 = 0.02 moles
The amount of nitrogen present in the sample = 0.02 x 14 = 0.28 g
The percentage of nitrogen in the soil sample = (0.28/0.75) x 100 = 37.33%
Therefore, the correct answer is option C) 37.33%.
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In the Kjeldahls method for estimation of nitrogen present in a soil s...
%N= 1.4× molarity of acid ×vol. of acid (in ml)× basicity of acid / mass of compounds. %N= 1.4×1×10×2/0.75 = 37.33
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In the Kjeldahls method for estimation of nitrogen present in a soil sample, ammonia evolvedfrom 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soilis :a)35.33b)43.33c)37.33d)45.33Correct answer is option 'C'. Can you explain this answer?
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In the Kjeldahls method for estimation of nitrogen present in a soil sample, ammonia evolvedfrom 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soilis :a)35.33b)43.33c)37.33d)45.33Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In the Kjeldahls method for estimation of nitrogen present in a soil sample, ammonia evolvedfrom 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soilis :a)35.33b)43.33c)37.33d)45.33Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the Kjeldahls method for estimation of nitrogen present in a soil sample, ammonia evolvedfrom 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soilis :a)35.33b)43.33c)37.33d)45.33Correct answer is option 'C'. Can you explain this answer?.
In the Kjeldahls method for estimation of nitrogen present in a soil sample, ammonia evolvedfrom 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soilis :a)35.33b)43.33c)37.33d)45.33Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In the Kjeldahls method for estimation of nitrogen present in a soil sample, ammonia evolvedfrom 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soilis :a)35.33b)43.33c)37.33d)45.33Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the Kjeldahls method for estimation of nitrogen present in a soil sample, ammonia evolvedfrom 0.75 g of sample neutralized 10 mL of 1M H2SO4. The percentage of nitrogen in the soilis :a)35.33b)43.33c)37.33d)45.33Correct answer is option 'C'. Can you explain this answer?.
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