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

  • Option 1)

    37.33

  • Option 2)

    45.33

  • Option 3)

    35.33

  • Option 4)

    43.33

 

Answers (2)

Kjeldahl's method

% of  N =\frac{14\times 2(V-\frac{V_1}{2})\times 100\times m }{1000\times m}

V= Vol \: of\: H_2SO_4

V_1= Vol \: of\: NaOH

m= mass \:of\:O.C

m= molarity

given \:m=0.75g

\frac{v-\frac{v_1}{2}}{m}= 10\:ml

\eta =1mol/l

% of N \frac{14\times 2\times 10\times 100\times 1}{1000\times 0.75} \:=37.33 %


Option 1)

37.33

Correct

Option 2)

45.33

Incorrect

Option 3)

35.33

Incorrect

Option 4)

43.33

Incorrect

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