Sulphamic acid

Sulfamic acid, also known as amidosulfonic acid, amidosulfuric acid, aminosulfonic acid, and sulfamidic acid, is a molecular compound with the formula H₃NSO₃. This colourless, water-soluble compound finds many applications. Sulfamic acid melts at 205 °C before decomposing at higher temperatures to water, sulfur trioxide, sulfur dioxide and nitrogen.

Sulfamic acid (H₃NSO₃) may be considered an intermediate compound between sulfuric acid (H₂SO₄), and sulfamide (H₄N₂SO₂), effectively replacing a hydroxyl (–OH) group with an amine (–NH₂) group at each step. This pattern can extend no further in either direction without breaking down the sulfonyl (–SO₂–) moiety. Sulfamates are derivatives of sulfamic acid.