# What do we call the salt, ZnSO_4*7H_2O?

Jan 2, 2016

$Z n S {O}_{4} \cdot 7 {H}_{2} O$ can be isolated as colourless, macroscopic crystals. The 7 water molecules are often referred to as waters of crystallization.
Zinc sulfate was known as white vitriol historically, because it is the salt of zinc and oil of vitriol (=sulfuric acid; ${H}_{2} S {O}_{4}$).