... sulfate, blue stone, blue vitriol, copper sulphate pendahydratcopper sulphate pentahydrate is stable at ambient temperature and pressure, not deliquescent, ... made anhydrous. Anhydrous also easily absorbing into copper sulphate pentahydrate. Often use this feature to test whether some of ... traces of organic matter in water. The copper sulphate pentahydrate heated to 650 degree heat, can be decomposed ...