Calcium Oxybromide, CaBr₂.3CaO.16H₂O

When calcium bromide solution is boiled with calcium hydroxide, and the liquid is filtered and cooled, beautiful needle-like crystals separate out. They are decomposed by water and alcohol, leaving lime, and their composition is represented by the formula CaBr₂.3CaO.16H₂O. On drying at 120° C. in an atmosphere free from carbon dioxide, a trihydrate, CaBr₂.3CaO.3H₂O, is formed.

Schreinemakers and Milikan, investigating the system CaBr₂: Ca(OH)₂: H₂O at 25° C., found an oxybromide 3CaBr₂.4CaO.16H₂O in addition to the compound CaBr₂.3CaO.16H₂O.