Sulfuric acid, commonly known as bad water, is a strong mineral acid with high corrosivity. Concentrated sulfuric acid refers to sulfuric acid solution with mass fraction greater than or equal to 70%. Concentrated sulfuric acid has strong oxidation at high concentration, which is one of the biggest differences between it and dilute sulfuric acid. At the same time, it also has dehydration, strong oxidation, strong corrosion, difficult volatility, acid, water absorption, etc.