Sulfuric acid is a very strong acid that can act as an oxidizingagent at high concentrations (very low pH, or even negative pHvalues). Under standard conditions, sulfuric acid has a lowreduction potential,

SO42?(aq)+4H+(aq)+2e??SO2(g)+2H2O(l), +0.20V

which means it cannot oxidize any of the halides F2, Cl2, Br2,or I2. If the H+ ion concentration is increased, however, thedriving force for the sulfuric acid reduction is also increasedaccording to Le Ch