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0.2 gm of an organic compound was analys...

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.

Text Solution

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Mass of organic compound `= 0.2g`
Unused acid required `= 40mL (N)/(10)NaOH`
`40mL (N)/(10)NaOH -= 40 mL (N)/(10) H_(2)SO_(4)`
`-= 20mL (N)/(5) H_(2)SO_(4)`
Acid used for absorption of ammonia
`= (60 - 20)mL (N)/(5) H_(2)SO_(4)`
`=40mL (N)/(5)H_(2)SO_(4)`
Percentage of nitrogen `= (1.4 xx N_(1)xxV)/(W) = (1.4 xx (1)/(5)xx40)/(0.2)`
`= (1.4 xx 40)/(0.2 xx 5) = 56%`
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