Definition of concentrated sulfuric acid
Concentrated sulfuric acid, commonly known as bad water, with the chemical formula H₂SO₄, is a strong mineral acid with high corrosivity. Concentrated sulfuric acid refers to a sulfuric acid solution with a mass fraction greater than or equal to 70%. Concentrated sulfuric acid is also highly corrosive: under normal pressure, boiling concentrated sulfuric acid can corrode all metals except iridium and ruthenium (even including gold and platinum), and the number of metal species that can be corroded even exceeds aqua regia. Sulfuric acid has strong oxidizing property at high concentration, which is one of the biggest differences between it and dilute sulfuric acid. At the same time, it also has dehydration, difficult volatility, acidity, water absorption, etc.