For 10 points, name this diprotic acid with formula H2SO4.
A mixture of this compound and hydrogen peroxide is used in the Piranha clean. This compound is produced along with hydrogen iodide in the Bunsen reaction, part of a cycle used to produce hydrogen gas. This compound is reacted with sodium chloride in the Mannheim process and is useful in the production of fertilizer because it is added to apatite in the "wet method" of phosphoric acid production. This compound can reversibly add a blocking group to benzene rings and protonates nitric acid for electrophilic aromatic substitution. A vanadium-five oxide catalyst is used for the production of this compound in the contact process. For 10 points, name this diprotic acid with formula H2SO4.
A mixture of this compound and hydrogen peroxide is used in the Piranha clean.
sulfuric acid [or oil of vitriol; or H2SO4 until it is read]