# How to quench unreacted sodium azide from reaction mixture?

The reaction involved synthesis of azide formation from alkyl bromide in DMF using sodium azide. After the reaction has taken place, how do I quench the unreacted sodium azide from the reaction mixture?

• Why do you want to "quench" it? – SteffX Aug 12 '16 at 14:16
• I happen to read about safety precautions regarding handling, using sodium azide. So I came across few web pages, where they warn you not to dispose it into the drain but try to quench it. So I thought about to get an opinion on this. Anyways I took my reaction mixture, extracted in ethyl acetate/water. And it worked well. – Chemsoh Aug 12 '16 at 18:59

$$\ce{2NaNO2 + H2SO4 → 2HNO2 + Na2SO4}$$
$$\ce{2NaN3 + 2HNO2 → 3N2 + 2NO + 2NaOH}$$