Following Kjeldahl's method, 1 g of organic compound released ammonia, that neutralised 10 mL of 2M . The percentage of nitrogen in the compound is %.

Question

Following Kjeldahl's method, 1 g of organic compound released ammonia, that neutralised 10 mL of 2M . The percentage of nitrogen in the compound is  %.

Canvas Classes · Accepted Answer

Step 1: Recall Kjeldahl's Method

In Kjeldahl's method:
1. Organic compound is heated with conc.  + catalyst ( + )
2. All nitrogen → 
3. NaOH is added →  gas is liberated
4.  is absorbed in known volume of standard acid ()
5. Excess acid is back-titrated with standard NaOH

Step 2: Calculate Moles of  Used by

Given:
- Volume of  = 10 mL
- Molarity of  = 2 M

is diprotic: 1 mole of  neutralises 2 moles of

Step 3: Calculate Moles and Mass of Nitrogen

Each mole of  contains one mole of N:

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