In Dumas' method for the estimation of nitrogen, a roll of reduced copper gauze is placed at the exi — Practical Organic Chemistry and Purification Chemistry Question

💡 Solution & Explanation

During combustion in Dumas' method, some nitrogen might react with oxygen to form oxides of nitrogen (e.g., $NO$, $NO_2$). The hot reduced copper gauze acts as a reducing agent to convert these oxides back into free $N_2$ gas before it is collected.