Copper(II) sulphate pentahydrate, ROTI®METIC 99,999 % (5N), Molar mass (M) 249,69 g/mol, Density (D) 2,286 g/cm³, CAS No. [7758-99-8], UN-Nr. 3077, EG-Nr. 616-477-9, Empirical formula CuSO4 · 5 H2O