Nitrous acid is obtained by the action of dilute HCl or H2SO4 on any nitrite. KNO2 + HCl → KCl + HNO2 NaNO2 + HCl → NaCl + HNO2 KNO2 + H2SO4 → KHSO4 + HNO2 Nitrous acid is obtained when di-nitrogen tri-Oxide is dissolved in cold water. N2O3 + H2O → 2HNO2 HNO2 is obtained by the action of barium nitrite and cold and dilute H2SO4.

In this video we will look at the equation for HNO2 + H2O and write the products. When we add HNO2 to H2O the HNO2 will dissociate and break into H+ and NO.