V2(SO4)3 + 12KSCN → 2K3[V(SCN)6] + 3K2SO4
Vanadium(III) sulfate react with potassium thiocyanate to produce hexathiocyanatovanadate(III) potassium and potassium sulfate. Potassium thiocyanate - concentrated solution. The reaction takes place in a concentrated solution sulfuric acid.