Concentrated sulfuric acid is a sulfuric acid aqueous solution with a mass fraction greater than or equal to 70%, commonly known as bad water. Concentrated sulfuric acid is highly corrosive: under normal pressure, boiling concentrated sulfuric acid can corrode all metals except iridium and ruthenium, and it can corrode even more metal elements than aqua regia.
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, non-volatility, acidity and water absorption. Similar to nitric acid, the reduction products may be sulfur dioxide, elemental sulfur or sulfide, which are affected by the type and dosage of reductant.
Storage of concentrated sulfuric acid:
Store in a cool and ventilated warehouse. The storage temperature shall not exceed 35℃ and the relative humidity shall not exceed 85%. Keep the container sealed. It shall be stored separately from flammable (combustible) materials, reducing agents, alkali, alkali metals and edible chemicals, and shall not be mixed. The storage area should be equipped with emergency response equipment for leakage and suitable accommodation materials.