Dissolve 0,695 g of ferrous sulphate, FeSO, 7 HO, in 100 ml of water, and add 1,485 g of orthophenanthroline monohydrate, CHN, HO.
Los 0,695 g ijzer(II)sulfaat, FeSO·7 HO, op in 100 ml water en voeg 1,485 g ortho-fenanthroline-monohydraat, CHN·HO, toe.