cupric cyanide tetrahydrate Hello. Welcome to solsarin. This post is about “cupric cyanide tetrahydrate“. Copper(II) sulfate Copper(II) sulfate, also known as copper sulphate, are the inorganic compounds with the chemical formula CuSO4(H2O)x, where x can range from 0 to 5. The pentahydrate (x = 5) is the most common form. Older names for this compound include blue vitriol, bluestone,[9] vitriol of copper,[10] and Roman vitriol.[11] …