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In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is

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Detailed Solution

H2SO4+2NH3⟶NH42SO410 mL of 1MH2SO4=10mmol M×V(mL)=mmolNH3 consumed =20mmol Acid used for the absorption of ammonia =20-10mmol=10 mL of 2 N (or 1M)H2SO4% of N=1.4×N×VW=1.4×2×100.75=37.33%
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