I-sulfuric acid ejiyile (H₂SO₄): i-asidi enamandla engaba ngu-96–98 % ngesisindo, ukuminyana okungaba ngu-1.84 g/cm³. Isomisi esinamandla ne-asidi enamandla esetshenziselwa ukwenza izingqa zombala, ukuhlanza izinsimbi nge-asidi, amabhethri nokusabela kwamakhemikhali okudinga i-asidi engaphenduki umusi. Ishisa kakhulu futhi ikhipha ukushisa okukhulu uma ihlangana namanzi: njalo faka i-asidi emanzini, ungalokothi ufake amanzi ku-asidi.