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A sample of 0.50 gm of an organic compou...

A sample of 0.50 gm of an organic compound was treated according to Kjeldahl's method the ammonia evolved was absorbed in 50 ml of `0.5MH_2SO_4`. The residual acid required 60 cm of 0.5M solution of `NaOH` for neutralisation. Find the percentage composition of nitrogen in the compound.

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To find the percentage composition of nitrogen in the organic compound using Kjeldahl's method, we can follow these steps: ### Step-by-Step Solution: 1. **Calculate the mEquivalents of H₂SO₄:** - The formula for calculating the number of mEquivalents is: \[ \text{mEquivalents} = \text{Volume (L)} \times \text{Molarity (M)} \times \text{n factor} ...
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A sample of 0.50 g of an organic compound was treated according to Kjeldahl's method. The ammonia evolved was absorbed in 50 mL of 0.5 M H_(2)SO_(4) . The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.

A sample of 0.50 g of an organic compound was treated according to Kjeldahl's method. The ammonia evolved was absorbed in 50 mL of 0.5 M H_(2)SO_(4) . The residual acid required 60 mL of 0.5 M solution of NaOH for neutralization. Find the percentage composition of nitrogen in the compound. Strategy: Step 1 . Convert molarity into normality using the relation Normality (N) = n xx Molarity (M) where n factor is either the acidity of base or basicity of acid. Step 2 . Calculate the milliequivalents of NaOH which is equal to the milliequivalents of unreacted H_(2)SO_(4) . Step 3 . Calculate the milliequivalents of total H_(2)SO_(4) and subtract the milliequivalents of unreacted H_(2)SO_(4) to get the milliequivalents of NH_(3) evolved. Step 4 . Calculate the equivalents of NH_(3) , moles of NH_(3) , and moles of N . Step 5 . Calculate the mass of N in the organic compound. Step 6 . Finally, calculate % of N or directly apply Eq. (13.8) or (13.9) to get the % of N in the organic compound.

Knowledge Check

  • A sample of a 0.5 g of an organic compound was heated according to Kjeldahls method. The ammonia evolved was absorbed in 50 mL of 0.5 M H_2SO_4 . The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.

    A
    36
    B
    56
    C
    76
    D
    86

  • A sample of 0.50 g of an organic compound was treated according to Kjeldahl's method. The ammonia evolved was absorbed in 50 mL of 0.5 M H_(2)SO_(4) . The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. What would be the percentage composition of nitrogen in the compound?

    A
    50
    B
    60
    C
    56
    D
    44

  • 1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of M/10 H_(2)SO_(4) solution. The excess sulphuric acid required 20 mL of M/10 NaOH solution for neutralization. The percentage of nitrogen in the compound is :

    A
    24
    B
    5
    C
    10
    D
    3

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    a. A sample of 0.50g of an organic compound was treated according to Kjeldahal's method. The ammonia evolved was aboserved in 50 ml of 0.5M H_(2)SO_(4) . The residual acid required 60 mL of 0.5M solution of NaOH for neutralisation. Find the percentage composition of hnitrogen in the compound. b. On analysis, 0.2g of a monobasic acid gave 0.505 gm of CO_(2) and 0.0864gm H_(2)O. 0.305 gm of this acid required 25 ml of M//10 NaOH solution for neutralisaton. Find the molecular formula of the acid. c. A liquid aromatic organcvi compound (A) conatining carbon (92.3%) and hydrogen (7.7%) decoluidsed KMnO_(4) and on ozonolysis gave methanal and another compound (B) . The molecular mass of (A) is 104 . On treatment with a suitable catalyisis, (A) gave a high molecular mass solid product (C) having the same empirical formula as that of compound (A) . Compound (C) is used in making toys and household goods. Identify (A),(B) , and (C) and explain the reactions. d. A sample of 0.246 gm of an organic compound gave 0.198 gm fo CO_(2) and 0.104 gm of H_(2)O on complete combusion. .37gm of the compound gave 0.638 gm of silver bromide in Carius method. What is the molecular formula of the compound if its molecular mass is 109 .

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