Used as a reducing agent in chemical synthesis, particularly in the production of caprolactam, a precursor to nylon-6. It plays a key role in hydroxylamine-O-sulfonic acid preparation, which is used in the synthesis of hydrazines and other nitrogen-containing compounds. Commonly applied in analytical chemistry for the determination of carbonyl compounds, such as aldehydes and ketones, through derivatization. Also utilized in electroless nickel plating as a stabilizer and reducing agent. In some cases, it serves in the treatment of wastewater to remove chlorine or as a scavenger for aldehydes. Handle with care due to its instability and potential for explosive decomposition under certain conditions.