Practical Organic Chemistry and PurificationhardMCQ SINGLE

In Kjeldahl's method, if the evolved ammonia is absorbed in of a standard acid of normality , what iPractical Organic Chemistry and Purification Chemistry Question

Question

In Kjeldahl's method, if the evolved ammonia is absorbed in $V\ \text{mL}$ of a standard acid of normality $N$, what is the expression for the mass of nitrogen (in grams) present in the evolved ammonia?

Answer: A

💡 Solution & Explanation

1000 mL of 1 N acid neutralizes 1000 mL of 1 N $NH_3$, which corresponds to 17 g of $NH_3$ and contains exactly 14 g of nitrogen. Therefore, $V\ \text{mL}$ of $N$ normality acid corresponds to $\frac{14 \times N \times V}{1000}\ \text{g}$ of nitrogen.

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