Antimony(III) chloride (CAS 10025-91-9): storage and disposal

Moisture is the first thing to keep away from this solid, because it fumes in damp air and gives off hydrochloric acid mist. Beyond that, it must be separated from oxidisers, which can react with corrosive stock and release heat or fumes, and from solvent cabinets, where a leak could break down the containers and feed a fire. Put it on a resistant tray low down in a ventilated corrosive store, with the lid tight and the jar standing inside a second container. In a school prep room that means a shelf of its own, not a place among the salts. Check metal shelf brackets for rust spotting.

Look at the container before the contents. A jar that is sound has a clean cap, a legible label and crystals that are loose and dry. A jar that has taken in moist air shows wet or sticky lumps, white powder around the lid and mist escaping when it is touched. The white deposit is what the solid becomes when water gets at it. Corroded cap liners, stained or peeling labels and rusty shelves beneath the jar point to long term leakage of fumes. A lid that will not turn should not be forced. Record what you see, leave the jar closed and note how long it has sat there.

By specialist collection only. It never goes down the drain or into general waste. It is normally packed in a corrosive other laboratory pack with compatible chemicals.

Collection is arranged as a specialist job, with the jar travelling as UN 1733 under waste code 16 05 06* when it is packed in a lab pack. Where it is simply a discarded inorganic chemical outside one, the code is 16 05 07*. Because it reacts with moisture, the packers keep it away from water bearing items, and your description of the cap and crust helps them plan that. Pouring it down a drain is not an option, nor is using a bin or skip, and nobody on site should try to neutralise it. Its harm to aquatic life is the reason for that.

Usually held as: legacy stock.

Part-used bottles and full containers are both fine. Tell us the size and how many, and an estimate is enough for a first price.