Cobalt(II) acetate tetrahydrate, min. 98 %, extra pure, Molar mass (M) 249,08 g/mol, Density (D) 1,7 g/cm³, CAS No. [6147-53-1], UN-Nr. 3077, EG-Nr. 200-755-8, Empirical formula Co(CH3COO)2 · 4 H2O