Preparation of ferrous sulphate heptahydrate
11.2 g iron filings dissolve in 40 ml of sulfuric acid (1:1). From the beginning, rapidly evolving, and therefore the beaker cover with a watch glass,
to avoid splashing the reaction mixture. After turbulent heat the reaction flask at about 70 ° C. After completion of the reaction, the solution is cooled,
precipitated crystals sucked off and washed with a little ethanol.
Product store in prachovnici (loses its water and air, is oxidized to ferric chloride).