Two equivalents of sodium chloride is added to one equivalent of this substance in the Mannheim process. The analyte is reacted with this substance in the first step of a method used to determine the amount of nitrogen in a substance; that is the Kjeldahl method. This substance is about 18 molar at 
Two equivalents of sodium chloride is added to one equivalent of this substance in the Mannheim process. The analyte is reacted with this substance in the first step of a method used to determine the amount of nitrogen in a substance; that is the Kjeldahl method. This substance is about 18 molar at 98% purity, and the 100% pure form of this substance has a Hammett function of negative 12. Vanadium oxide pellets are used as a (*) catalyst for the production of this substance in the contact process, and it's not nitric acid but this substance is used as a proton donor in the first step of arene nitration. The fuming form of this substance is commonly referred to as oleum. For 10 points, name this strong acid commonly found in lead-based batteries, with formula H2SO4.
Two equivalents of sodium chloride is added to one equivalent of this substance in the Mannheim process.
sulfuric acid [or oil of vitriol]