Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1M solution. The percentage of nitrogen in the

Question

Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1M  solution. The percentage of nitrogen in the compound is  (Nearest Integer)

Canvas Classes · Accepted Answer

Step 1: Recall Kjeldahl's Method Principle

In Kjeldahl's method:

is diprotic: 1 mol  neutralises 2 mol  (or 2 mol N)

Step 2: Calculate Moles of Acid Used

Given:
- Volume of  = 12.5 mL = 0.0125 L
- Molarity of  = 1 M

Step 3: Calculate Moles of NH₃ (and N)

Since  is diprotic:

Step 4: Calculate Mass of Nitrogen

Step 5: Calculate Percentage of Nitrogen

Mass of compound = 0.55 g

Answer: 64 (nearest integer)

Key Points to Remember:
-  is diprotic: multiply moles of  by 2 to get m

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