H2SO4 is commonly known as Sulfuric acid. As the name suggests, this compound is an acid. Generally an acid, is a proton donor, has a pH below 7, neutralizes base and turns blue litmus paper to red. This also means that in a solution (in water) H2SO4 produces Hydronium ions (H+ ions).
The chemical equation for the dissociation of Sulfuric acid (H2SO4 ) in the solution can be written as:
H2SO4 (aq) ---> H+ + HSO4- 1st protonation
HSO4- ----> H+ + SO4 2- 2nd protonation
**H2SO4 contains 2 H that can be protonated.
Sulfuric acid is classified as a strong acid.