Sulfuric acid acts as a strong diprotic acid in an aqueous solution. This means a single molecule can donate two protons (H+) into the water. The first proton separates almost completely to create a highly acidic environment.
Concentrated sulfuric acid also functions as a remarkably powerful dehydrating agent. It violently pulls the elements of water directly out of many organic materials. Mixing this acid with simple sugars or paper quickly strips away the bound water.
This intense chemical reaction releases a massive amount of heat energy. It leaves behind a rapidly growing pile of black elemental carbon. Industries primarily produce sulfuric acid through a method known as the contact process.
First, they oxidize sulfur dioxide gas to transform it into sulfur trioxide. This step requires a solid vanadium(V) oxide catalyst to speed up the reaction. Next, they absorb the sulfur trioxide into concentrated sulfuric acid to form fuming oleum.
Workers then carefully dilute this oleum with water to reach the final desired concentration. Hot and concentrated sulfuric acid also acts as a very potent oxidizing agent. An oxidizing agent is a substance that forcefully takes electrons from other chemicals.
At elevated temperatures, it reacts directly with non-metals like solid carbon and sulfur. The global agricultural sector consumes the largest share of this acid every single year. They use it to produce the phosphoric acid needed for agricultural phosphate fertilizers.