# 12.22.    Differentiate between the principle of estimation of nitrogen in an organic compound by                (i)  Dumas method

In the Dumas method, Nitrogen containing organic compound is heated with the copper oxide in carbon dioxide atmosphere, yields free nitrogen in addition to $CO_{2}$ and water.

$C_xH_yN_z+(2x+\frac{y}{2})CuO\rightarrow xCO_{2}+\frac{y}{2}H_{2}O+\frac{z}{2}N_2+(2x+\frac{y}{2})Cu$
Traces of nitrogen oxides can also be formed in the reaction, which can be reduced to nitrogen by passing the gaseous mixture over the heated copper gauge. The produced mixture of gases is collected over by an aqueous solution of $KOH$, it absorbs $CO_{2}$. Nitrogen is collected in the upper part of the graduated tube.

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