Nickel(II) nitrate hexahydrate, ROTI®METIC 99,999 % (5N), Molar mass (M) 290,81 g/mol, Density (D) 2,05 g/cm³, Boiling point (bp) 136,7 °C, CAS No. [13478-00-7], UN-Nr. 2725, EG-Nr. 236-068-5, Empirical formula Ni(NO3)2 · 6 H2O