A smoke bomb with a nasty smell is made from two solids.
name: Analgin and urea peroxide react producing a large number of different products.
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The reaction between analginum (methamizole) and urea peroxide is complicated and is not fully understood. A very complex mixture of chemical reaction products is produced. One of the proposed explanations sounds as follows:
Both sulfo and methylamine groups of methamizole are involved in the reaction. The first step is the reaction of sulfo group with hydrogen peroxide:
-SO3 + 2H2O2 → H2S + H2O + 3O2
At the second step the water formed in first reaction leads to partial hydrolysis of C-N bond. Methylamine is cleaved.
2-NCH3 + 2H2O → 2H2NCH3 + O2
Hydrogen sulfide reacts with methylamine giving methyl ammonium hydrosulfide:
H2NCH3 + H2S → [H3NCH3]HS
The suspension of methyl ammonium hydrosulfide crystals in air creates a visual effect of “smoke”. The specific nasty smell is caused by the presence of methylamine and hydrogen sulfide.