In kjeldahl's method to estimate nitrogen, compound is heated with conc. `H_(2)SO_(4)` in presence of

Options

A. `CaSO_(4)`
B. `(NH_(4))_(2)SO_(4)`
C. `CuSO_(4)`
D. `P_(2)O_(5)`

Answer

**Step-by-Step Solution:**

1. **Understanding Kjeldahl's Method**: The Kjeldahl method is a widely used technique for determining the nitrogen content in organic compounds. It involves the digestion of the sample in concentrated sulfuric acid.

2. **Heating with Concentrated Sulfuric Acid**: In this method, the organic compound is heated with concentrated sulfuric acid (H₂SO₄). This step is crucial as it breaks down the organic material and converts nitrogen into a measurable form.

3. **Adding Catalysts and Other Compounds**: To facilitate the reaction, certain compounds are added. In this case, we consider the presence of:
- **Potassium Sulfate (K₂SO₄)**: This compound is added to increase the boiling point of sulfuric acid, allowing the digestion to occur at a higher temperature.
- **Copper Sulfate (CuSO₄)**: This acts as a catalyst in the reaction, speeding up the conversion of nitrogen into ammonium sulfate.
- **Calcium Sulfate (CaSO₄)** and **Phosphorus Pentoxide (P₂O₅)** are not used in this method for the digestion process.

4. **Conversion to Ammonium Sulfate**: The nitrogen present in the organic compound is ultimately converted into ammonium sulfate (NH₄)₂SO₄ during the digestion process.

5. **Conclusion**: The correct answer to the question is that in Kjeldahl's method, the compound is heated with concentrated sulfuric acid in the presence of **copper sulfate** and **potassium sulfate**.

**Final Answer**: The compound is heated with concentrated sulfuric acid in the presence of copper sulfate and potassium sulfate.

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