ZnBr22H2O

Zinc bromide dihydrate, with the chemical formula ZnBr2·2H2O, is an inorganic compound. It is a hydrated salt of zinc bromide. In its pure form, it appears as white crystals. The compound is soluble in water and also exhibits solubility in polar organic solvents such as ethanol and acetone.

ZnBr2·2H2O can be synthesized by the reaction of zinc oxide or zinc carbonate with hydrobromic acid, followed by crystallization from an aqueous solution. Another method involves the direct reaction of zinc metal with bromine in the presence of water. Careful control of conditions is necessary to obtain the dihydrate form, as other hydrates can also exist.

This compound finds applications in several areas. It has been explored as an electrolyte component in certain types of batteries, particularly zinc-bromine flow batteries, due to its conductivity. Its ability to absorb moisture also leads to its use as a desiccant in specific contexts. Furthermore, zinc bromide dihydrate can serve as a precursor for the synthesis of anhydrous zinc bromide and other zinc-containing materials. Its handling requires appropriate safety measures, as it can be irritating to the skin and eyes.