In Kjeldahl's estimation of nitrogen, the standard formula used to calculate the percentage of nitrogen is . Physically, what does the term directly represent?

Question

In Kjeldahl's estimation of nitrogen, the standard formula used to calculate the percentage of nitrogen is $\%N = \frac{1.4 	imes (N_1V_1 - N_2V_2)}{W}$. Physically, what does the term $(N_1V_1 - N_2V_2)$ directly represent?

Prashant Kotian · Accepted Answer

Correct answer: C. represents the total milli-equivalents of standard acid taken. represents the milli-equivalents of base used in back-titration, which equals the unreacted acid. The difference gives the milli-equivalents of acid neutralized by the evolved . Thus, it exactly equals the milli-equivalents of produced.

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