1 gm. of coal sample was used for determination of nitrogen. The ammonia evolved was passed into 50ml of 0.1 N H2SO4, the excess acid required 42 ml. of 0.1N NaOH for neutralization Calculate % of N.

Q.1 (g) 1 gm. of coal sample was used for determination of nitrogen. The ammonia evolved was passed into 50ml of 0.1 N H₂SO₄, the excess acid required 42 ml. of 0.1N NaOH for neutralization Calculate % of N.

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Given: W = 1 g; acid taken = 50 mL of 0.1 N H₂SO₄; excess acid = 42 mL of 0.1 N NaOH.

Volume of 0.1 N acid used by NH₃ = 50 − 42 = 8 mL.

\( \%N = \dfrac{1.4 \times N \times V}{W} = \dfrac{1.4 \times 0.1 \times 8}{1} \)

(1000 mL of 1 N NH₃ contains 14 g of N, so 1.4 is the factor 14 × 100 / 1000.)

% Nitrogen = 1.12 %

Doubtly AI · 25 Oct 2026 AI-verified · Oct 2026 Report

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1 gm. of coal sample was used for determination of nitrogen. The ammonia evolved was passed into 50ml of 0.1 N H2SO4, the excess acid required 42 ml. of 0.1N NaOH for neutralization Calculate % of N.

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