Preparation ferrates barium
to 50-70 ml flasks těžkotavitelného glass placed 10 g freshly vyredukovaného iron and 20 g of potassium nitrate (both substances must be dry) and mix thoroughly homogenized. The reaction of starting up the burner. Movement is strongly exothermic and can occur even sparks. After completion of the reaction flask and cooled leached formed železnan potassium 4x50 ml of ice water. The solution was filtered through a glass filter (the need to use it washed glass wool). To the filtrate add 5.9 to 8.2 g saturated solution of BaCl 2 > sub>. After settling purple precipitate (for several hours) the mixture was filtered, washed with water, ethanol and finally with ether. Precipitate, dry it and sealed to the vial (železnan is sensitive to moisture and air spreads). ferrates of alkali metals are stronger oxidants than permanganates.