In the Kjedahl's method for estimation of nitrogen present in soil sample, ammonia evolved from 0.75 g of…

In the Kjedahl's method for estimation of nitrogen present in soil sample, ammonia evolved from 0.75g of sample neutralized 10ml of 1M H2SO4 The percentage of nitrogen in the soil is:
  1. 37.83
  2. 45.32
  3. 35.33
  4. 45.33

Solution

moles of 1M H2SO4=10 m mol
moles of NH3 consumed = 20 m mol
Weight of N=14×201000g=0.280 g
% N=0.2800.75×100=37.33%

Asked in: NEET 2014

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