2NaNO2 + 2AgNO3 + 4Na(Hg) + 2H2O → Ag2N2O2 + 4NaOH + 2NaNO3
Sodium nitrite react with silver(I) nitrate, sodium amalgam and water to produce silver(I) giponitrite, sodium hydroxide and sodium nitrate. This reaction takes place at a temperature near 0°C [8].