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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).

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