A base product fluid is produced by adding anhydrous liquid ammonia and a first portion of sulfuric acid to water flowing in a process line to form a mixed fluid. The mixed fluid may be cooled by flowing the mixed fluid through a heat exchanger. A second portion of sulfuric acid may be added to the mixed fluid to form the base product fluid. The second portion of sulfuric acid may be greater, by weight, than the first portion of sulfuric acid. The base product fluid may include a molecular compound that is a chelating compound. The molecular compound may have the formula: ((NH4)2SO4)a.(H2SO4)b.(H2O)c.(NH4HSO4)x.