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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 smmonia 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.

A

36

B

56

C

76

D

86

Text Solution

Verified by Experts

The correct Answer is:
B
`"% of S " =N_2 = (28 xx 0.5 xx (50 - (60)/(2))xx 100)/(1000 xx 0.5)`
`=(28xx 0.5 xx 20 xx 100)/(1000 xx 0.5)= 56`
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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 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.

0.50 gm of an organic compound was treated according to Kjeldahl's meghod. The ammonia evolved was absorbed in 50 ml of 0.5 MH_2SO_4 . The residual acid required 60 ml of (M)/(2)NaOH solution. Find the percentage of nitrogen in the compound.

0.4 gm of an organic compound was treated according to Kjeldahl's method. The ammonia evoled was absorbed in 50 ml or 0.5MH_3PO_3 . The residual acid required 30 ml of 0.5MCa(OH)_2 Find the percentage of N_2 in the compound.

0.2 gm of an organic compound was analysed by kjeldahl's method the ammonia evolved was absorbed in 60 ml (N)/(5)H_2SO_4 . Unused acid required 40 ml of (N)/(10)NaOH for complete neutralisation. Find the percentage of nitrogen in the compound.

MARVEL PUBLICATION-BASIC PRINCIPLES AND TECHNIQUES IN ORGANIC CHEMISTRY-Test your grasp
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