Cobalt(II) selenite dihydrate. is a chemical compound registered under CAS number 19034-13-0, with the molecular formula Co. H2 O3 Se . 2 H2 O and a molecular weight of about 221.92 g/mol. It is also known as Cobalt(II) selenite dihydrate. DeWeiChem supplies Cobalt(II) selenite dihydrate. for laboratory research and bulk production; product code 1240047. Send an inquiry for purity, packaging, price and lead time.