Zinc Perchlorate, Zn(ClO₄)₂

Deliquescent prismatic crystals are obtained by double decomposition between zinc sulphate and barium perchlorate. They dissolve in alcohol. Salvadori has obtained the hydrates Zn(ClO₄)₂.6H₂O and Zn(ClO₄)₂.4H₂O, and the compound Zn(ClO₄)₂. 4NH₄. Both hydrates are strongly hygroscopic, and decompose on heating before all water is eliminated. The ammonia compound is not very stable.