Hyponitrous acid 连二次硝酸
Hyponitrous acid is the chemical compound H2N2O2. This can be formulated as HON=NOH and is an isomer of nitramide, (H2N−NO2). It forms white crystals that are explosive when dry.
Hyponitrous acid is a weak acid (pKa1 = 7.21, pKa2 = 11.54) in aqueous solution and decomposes to N2O and water with a half-life of 16 days at 25 °C at pH 1–3.