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The ammonia evolved from 0.21 g of an or...

The ammonia evolved from 0.21 g of an organic compound by Kjeldahl method neutralised 15 ml of N/20 sulphuric acid solution. Calculate the percentage of nitrogen.

Text Solution

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`"weight of organic compound = 0.21 g"`
`"Normality of acid "=(N)/(20)`
Volume of standard acid
neutralised by ammonia = 15 ml
1000 ml of 1N ammonia contains = 14 g of nitrogen
15 ml of ammonia of normality
`(N)/(20)" conains nitrogen "=(14xx15xx1)/(1000xx20)`
0.21 g of compound contains nitrogen
`=(14xx15)/(1000xx20)`
100 g of compound contains nitrogen
`=(14xx15xx100)/(1000xx20xx0.21)=5g`
`therefore" Percentage of nitrogen = 5"`
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Knowledge Check

  • For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evoled ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted aicd required 20 mL of M/10 sodium hydroxide for complete neutralisation. The precentage of nitrogen in the compound is-

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