Two practical methods to prepare a bromine–dichloromethane solution using ammonium persulfate as the oxidant. Method 1 starts from sodium bromide, generates bromine in situ, and extracts into dichloromethane with cooling, condensation, and a sodium thiosulfate quench; the product is a bromine–dichloromethane solution with an approximate yield of 40–45 g bromine (about 55% ± 5% of the starting bromide) in ~98 g of material. Method 2 is a slower, more dilute variant that requires about 24 hours for bromine formation and can be followed by extraction with dichloromethane; yields are not quantitative but suitable for demonstrations. Safety notes: bromine is hazardous and corrosive; use proper ventilation, cooling, and refrigeration for storage; bromine can degrade plastics. The video also suggests that the bromine–dichloromethane solution is as useful as the distilled form for organic synthesis and demonstrations.
