# What is the chemical formula for blue vitriol, whose systematic name is copper(II) sulfate?

$C u S {O}_{4.} 5 {H}_{2} O$
Actually the compound ,blue vitriol is a hydrated crystalline substance ,so its formula is written as $C u S {O}_{4.} 5 {H}_{2} O$
and its chemically known as $\textcolor{b l u e}{\text{copper(II)sulphate pentahydrate}}$